Nucleosídeos

<p>7-(2-C-Methyl-b-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-2-amine (Ampyra) is a synthetic nucleoside activator of the deoxyribonucleoside monophosphate (dNMP) and dNMP diphosphate (dNDP) pathways. It has antiviral and anticancer activities, as well as an inhibitory effect on DNA synthesis by blocking the polymerization of deoxyribonucleotides.<br>It is also an inhibitor of histone acetyltransferase and may be useful in the treatment of Alzheimer's disease. Ampryra is a novel compound with high purity and high quality. It is phosphoramidite that can be used for the preparation of oligodeoxynucleotides for use in DNA sequencing or gene therapy.</p>

<p>2-Chloro-6-O-methylinosine is a modified nucleoside analog. Its structure is based on inosine and at position 2 a chlorine atom replaces the hydrogen. At position 6, the keto oxygen (normally part of the purine ring) is O-methylated, forming a methoxy group (-OCH₃)</p>

<p>N-Benzoyl-2'-deoxy-2'-fluoroadenosine, 3'-(hydrogen phosphonate) is a novel nucleoside that inhibits the replication of virus by binding to viral RNA. It is synthesized by reacting 2'-deoxy-2'-fluoroadenosine with pentafluorophenyl phosphate in the presence of an activator such as dicyclohexylcarbodiimide or N-hydroxysuccinimide. The synthesis of N-benzoyl-2'-deoxy-2'-fluoroadenosine, 3'-(hydrogen phosphonate) can be accomplished using commercially available nucleosides and phosphoramidites.</p>

<p>2,3'-Anhydro-5'-O-tert-butyldiphenylsilylthymidine is a synthetically modified thymidine analog for use in research</p>

<p>2’-Deoxy-2’-fluoro nucleosides and nucleotides have been shown to demonstrate anti-viral activity against influenza, SARS and HIV. More specifically the phosphonate of 2'-Deoxy-2'-fluoroadenosine has been evaluated as an inhibitor of Hepacivirus C (HCV).</p>

<p>2-Iodoadenosine is a chemical compound that is produced from the oxidation of uridine. It is used in the synthesis of peptides, which are important for biological processes like signal transduction and cell growth. 2-Iodoadenosine can be made by coupling other molecules to an adenosine molecule. This process involves a cross-coupling reaction with palladium catalysts or hydroxylation reactions with sodium borohydride. The resulting product has been shown to have anticancer and anti-microbial activities against protozoan parasites and cyclic peptide structures.</p>

<p>6-Chloro-7-deaza-9-(b-D-ribofuranosyl)purine is a novel nucleoside that has been shown to be an efficient activator of the transcription factor NFκB in vitro. 6-Chloro-7-deaza-9-(b-D-ribofuranosyl)purine is synthesized by phosphoramidite chemistry and purified by HPLC. It has been demonstrated to inhibit the replication of human immunodeficiency virus (HIV) in a dose dependent manner, which may be due to its ability to inhibit the synthesis of viral DNA and RNA. This product is highly pure and can be used for many purposes, including as a synthetic building block for DNA or as an antiviral drug.</p>

<p>1,5-Anhydro-3-O-benzoyl-4,6-O-benzylidene-2-deoxy-2-(N4-benzoylcytidin-1-yl)-D-altro-hexitol is a synthetic nucleoside analog for use in research</p>

<p>1-(2’-Deoxy-2’-fluoro-b-D-arabinofuranosyl)-N3-[3-(tert-butoxycarbonyl)amino]propyluracil is a nucleoside with antiviral and anticancer properties. It is an activator of DNA synthesis and has been shown to inhibit the proliferation of cancer cells. 1-(2’-Deoxy-2’-fluoro-b-D-arabinofuranosyl)-N3-[3-(tert-butoxycarbonyl)amino]propyluracil is a modified nucleoside that has been synthesized by modifying the sugar moiety of ribonucleosides or deoxyribonucleosides. It contains a 2'-deoxypyrimidine base, which can be substituted with different atoms or groups to produce different drugs. The drug inhibits viral replication by inhibiting the growth of</p>

<p>5'-O-p-Anisoyl-3'-azido-2',3'-dideoxyuridine is a compound that inhibits DNA synthesis and viral replication. It is an antiviral agent that inhibits the activation of virus by blocking the incorporation of deoxyribonucleotide triphosphates into viral DNA chains. This compound also has anticancer activity, which may be due to its ability to inhibit RNA synthesis in tumor cells.</p>

<p>Azathioprine is a drug that suppresses the immune system and is used to treat autoimmune disorders such as rheumatoid arthritis, lupus erythematosus, and inflammatory bowel disease. It is an immunosuppressant that prevents the formation of antibodies by blocking the enzyme thiopurine S-methyltransferase. Azathioprine is metabolized in the liver to 6-mercaptopurine, which has been shown to cause leukopenia. The genetic polymorphism of this enzyme can lead to differences in the metabolism and toxicity of azathioprine therapy.</p>

<p>N-Acetyl-2'-O-[(tert-butyl)dimethylsilyl]-5'-O-DMT-6'-O-methylguanosine-3'-CE phosphoramidite is a nucleoside and nucleotide analog. It is synthesized by reacting 2'-deoxyguanosine with acetyl chloride, 5'-dimethoxytrityl chloride, and 3'-Ce phosphoramidite in an organic solvent. N-Acetyl-2'-O-[(tert-butyl)dimethylsilyl]-5'-O-DMT-6'-O-methylguanosine has been shown to inhibit the growth of cancer cells and viruses in cell culture studies. It is also a potent inhibitor of HIV replication in vitro.</p>

<p>2'-Deoxyadenosine 5'-a-thiotriphosphate sodium salt is an antiviral nucleotide analog that has been modified to have a novel structure. It is phosphorylated in vivo to form 2'-deoxyadenosine 5'-a-thiotriphosphate. The nucleoside can inhibit viral DNA synthesis and help prevent the spread of HIV, herpes virus type I, herpes virus type II, influenza virus, and other viruses. This compound also has anticancer activity and has been shown to be effective against leukemia cells.</p>

<p>5-Carbamoylmethyluridine is a nucleoside that is structurally related to uridine. It is synthesized from uridine by methyl esterification with carbamic acid and methoxycarbonyl chloride. 5-Carbamoylmethyluridine interacts with actin filaments and has been shown to alter the expression of messenger RNA in eukaryotes. 5-Carbamoylmethyluridine also acts as a competitive inhibitor of the formation of a ternary complex, which includes ATP, GTP, and UTP, at the level of ribonucleotide reductase. This inhibition leads to decreased synthesis of messenger RNA in cells.</p>

<p>3’-b-Amino-2’,3’-dideoxy-5-methyl-5’-O-trityluridine is an antiviral nucleoside that can inhibit the synthesis of DNA in cells. It has been shown to be active against Hepatitis B and Human Immunodeficiency Virus (HIV). This drug has also been shown to have anticancer properties. 3’-b-Amino-2’,3’-dideoxy-5-methyl-5’-O -trityluridine is a novel nucleoside modified at the 5′ position with a trityl group and with an amino group at the 3′ position. 3′ b -amino 2 ′,3 ′ -dideoxy 5 ′ -methyl 5 ′ -O trityl uridine is water soluble and stable in acid conditions.</p>

<p>4'-C-Azido-2'-deoxy-2'-fluoro-β-D-arabinocytidine (4FA) is a potent inhibitor of the growth of HIV. It has been shown to inhibit the production of inflammatory cytokines and chemokines, which are associated with inflammatory diseases such as arthritis and asthma. 4FA has also been shown to inhibit glycogen synthase kinase 3 (GSK3), which is involved in the regulation of cellular signaling pathways that control cell growth and proliferation. Furthermore, 4FA inhibits an enzyme that is needed for viral replication and can be used as a therapeutic agent against viruses such as hepatitis C virus.</p>

<p>6-Amino-4-methoxy-2-(b-D-ribofuranosyl)-2H-pyrazolo[3,4-d]pyrimidine is a novel antiviral monophosphate nucleoside. It has been shown to be an activator of the transcription factor NFAT and to inhibit the replication of human immunodeficiency virus (HIV). 6-Amino-4-methoxy-2-(b-D-ribofuranosyl)-2H-pyrazolo[3,4-d]pyrimidine is synthesized from 2,6 dihydroxybenzaldehyde and 3,5 dibenzyloxybenzaldehyde using phosphoramidites. The product is purified by HPLC.</p>

<p>2'-Deoxy-5'-DMT(2-E-bromoethenyl)uridine 3'-CE phosphoramidite is a synthesized nucleoside used for the preparation of oligonucleotides. It is used in the synthesis of oligonucleotides as an activator, monophosphate, or nucleotide. 2'-Deoxy-5'-DMT(2-E-bromoethenyl)uridine 3'-CE phosphoramidite is a novel and high quality chemical that has not been previously reported. It is typically stored at -20℃. 2'-Deoxy-5'-DMT(2-E-bromoethenyl)uridine 3'-CE phosphoramidite may be incompatible with strong oxidizing agents, strong acids, strong bases, and metal ions.</p>

<p>3'-Deoxy-3'-fluoro-5'-O-toluoylcytidine is a monophosphate nucleoside of cytidine. It is a phosphoramidite building block for the synthesis of DNA, an antiviral and anticancer agent. 3'-Deoxy-3'-fluoro-5'-O-toluoylcytidine has been shown to inhibit the replication of HIV and herpes simplex virus (HSV) in cell cultures and to induce apoptosis in cancer cells by inhibiting protein synthesis and inducing oxidative stress. This nucleoside is synthesized from deoxythymidine 5' phosphate using phosphorus pentoxide as oxidizing agent, followed by a reaction with toluene. The novel 3'-deoxy-3'-fluoro-5'-O-toluoylcytidine can be used as an activator for other modified nucleotides in DNA synthesis or as scaffold for the</p>

<p>Nelarabine is a drug that prevents the growth of cells by inhibiting the bcr-abl kinase, which is an intracellular target. This drug has been shown to be effective against pediatric patients with t-cell acute lymphoblastic leukemia and adults with chronic myeloid leukemia. Nelarabine has minimal toxicity in humans and is not toxic to healthy cells. It has been shown to have anti-inflammatory properties and may be used as a biomarker for autoimmune diseases. Nelarabine also inhibits angiogenesis, which may be due to its effects on nuclear DNA.</p>

<p>6-Amino-2,5-dihydro-2-(b-D-ribofuranosyl)-4H-pyrazolo[3,4-d]pyrimidin-4-one is a novel chemical. It is a nucleoside analog that has been shown to inhibit the growth of cancer cells in vitro and in vivo. 6-Amino-2,5-dihydro-2-(b-D ribofuranosyl)-4H pyrazolo[3,4 d]pyrimidin 4 one has also been shown to inhibit viral replication. It is phosphoramidites that are modified with bifunctional linkers for coupling to DNA or RNA molecules. 6 amino 2 5 dihydro 2 (b D ribofuranosyl) 4 H pyrazolo 3 4 d pyrimidine 4 one has high purity and high quality.</p>

<p>N-Phenylpyridin-4-amine is a tautomeric compound that has been shown to inhibit the growth of cancer cells. It is able to bind to tyrosine kinase and inhibit its activity, which affects the proliferation of cancer cells. N-Phenylpyridin-4-amine also inhibits mitochondrial functions by inhibiting cytochrome c oxidase. This drug also has an anti-inflammatory effect, inhibiting the production of cytokines such as IL1β, IL6, and TNFα. The biological function of N-Phenylpyridin-4-amine is not yet fully understood. It may be due to the inhibition of protein tyrosine phosphatases (such as PTP1B), which are involved in insulin signalling pathways.</p>

<p>Anti-viral; anti-neoplastic</p>

<p>5'-Deoxy-5'-fluoro-5'-(methylthio)adenosine is an analogue of adenosine that has inhibitory activities on the biosynthetic pathway of polyamines. It has been shown to have a cytostatic effect on murine leukemia cells in vitro. 5'-Deoxy-5'-fluoro-5'-(methylthio)adenosine inhibits the production of polyamines by interfering with the enzyme responsible for their biosynthesis, ornithine decarboxylase. 5'-Deoxy-5'-fluoro-5'-(methylthio)adenosine also inhibits the growth of murine leukemia cells and other leukemia cell lines, including L1210 and MM1.</p>

<p>5'-O-p-Anisoyl-2'-deoxyuridine 3'-CE phosphoramidite is an anticancer nucleoside analog that inhibits viral replication. It is a modified nucleoside with a 5' anisoyl group and a 2' deoxyuridine moiety. This compound is synthesized by reacting the 5'-O-p-anisoyl-2'-deoxyuridine 3'-cyclohexylphosphate with <br>phosphorus oxychloride to form the 5'-O-p-anisoyl-2'-deoxyuridine 3'-cyanoethyl phosphoramidite, which can be used for the synthesis of DNA or RNA. The phosphoramidite can also be used as an activator in polymerase chain reactions (PCR).</p>

<p>1-(2'-O-4-C-Methylene-b-D-ribofuranosyl)thymine is a nucleoside analog with a modified ribofuranosyl sugar, which includes a 2'-O-4'-C-methylene bridge that constrains the sugar conformation.</p>

<p>N4-Acetyl-5'-O-DMT-2'-O-methylcytidine is a cytidine analogue that has been synthesized to be used as an enzyme-linked probe. It is labelled with biotin and can be detected by binding to an antibody which has been labelled with a fluorescent tag. Cytidine analogues are synthesized on a solid phase and then cleaved from the support material. The spacer arm is added to the 5' end of the nucleotide and the 3'-OH group is modified with 2'-O-methyl groups. N4-Acetyl-5'-O-DMT-2'-O-methylcytidine has been shown to be sensitive in techniques such as solid phase synthesis, nucleic acid research, and immunoassays.</p>

<p>5'-Azido-5'-deoxy-2'-O-methyluridine is a nucleoside that is a modified version of 2'-deoxyuridine. It is synthesized from uridine, which is converted to 5'-azidouridine via the action of azidase. 5'-Azido-5'-deoxy-2'-O-methyluridine has antiviral activity and can be used as an activator of DNA polymerases. The monophosphate form of this compound can be phosphoramidated to give the corresponding diphosphates, which are used in DNA synthesis to produce double stranded DNA.</p>

<p>2'-Deoxy-5'-O-pixyluridine (2DPU) is a novel, synthetic nucleoside that is an active ingredient in antiviral and anticancer drugs. 2DPU has been shown to inhibit the replication of human immunodeficiency virus type 1 (HIV-1) by inhibiting the viral enzyme HIV reverse transcriptase. The phosphoramidite form of 2DPU is used as a building block for DNA synthesis and for the synthesis of other nucleosides. The monophosphate form of 2DPU is used in the synthesis of antiviral drugs, including acyclovir, zidovudine, and ribavirin.</p>

<p>2'-Deoxycytidine-5'-monophosphate (dCMP) is a nucleotide that is synthesized by the enzyme cytidine monophosphate synthetase. It has been shown to inhibit the activity of many enzymes, including those involved in DNA synthesis and repair. The incorporation of dCMP into DNA can be used as a probe for studying various biological processes, such as radiation damage and cellular physiology. In addition, it has been shown that dCMP inhibits the growth of human osteosarcoma cells. This drug is also used in combination preparations with other drugs, such as with 5-fluorouracil and doxorubicin, to treat cancer tumors.</p>

<p>Xanthosine 5'-monophosphate disodium salt is a nucleotide that has been shown to react with nitrite in aqueous solution to form xanthosine 5'-monophosphate. The reaction system can be prepared by adding nitrite to a solution of xanthosine 5'-monophosphate disodium salt and deionized water. The crystallization process can be done by adding ethanol dropwise to the reaction system under controlled conditions. Impurities may result from the preparation process, such as sodium chloride, sodium sulfate, and sodium hydroxide.</p>

<p>2'-Deoxy-5'-O-DMT-2'-fluoro-N2-isobutyrylguanosine 3'-CE phosphoramidite is a novel nucleoside analog, which has potent antiviral activity against HIV and other retroviruses. It is synthesized from 5'-O-DMT-2'-fluoro-N2-isobutyrylguanosine by the reaction of sodium bicarbonate with 2',3'-dideoxyadenosine in the presence of an activator. The product can be used for the synthesis of RNA or DNA for use as probes, primers, and templates in polymerase chain reactions (PCRs).</p>

<p>6mer oligonucleotide</p>

<p>4'-C-Fluoroadenosine is a fluorine-substituted analog of adenosine, which has been shown to have minimal toxicity in animals. 4'-C-Fluoroadenosine inhibits the uptake of trypanosomes by macrophages and has been shown to be effective in treating Leishmania donovani infections in mice. Its mechanism of action is not yet clear, but it may involve inhibiting the enzymatic activity of enzymes involved in the metabolism of adenosine and/or enhancing the activity of those that are involved in catalysing adenoside triphosphate synthesis.</p>

<p>3’-Deoxy-5-fluoro-3’-methyluridine is a nucleoside that has antiviral and anticancer properties. It is synthesized from 5-fluorouracil, which is a prodrug that is activated by 3’-deoxy-5-fluoro-3’-methyl uridine to produce 5′,6′ difluorodeoxyadenosine. This compound can be used in the treatment of hepatitis B virus and hepatitis C virus infections. 3’-Deoxy-5-fluoro-3’ methyluridine has also been shown to inhibit the growth of cancer cells in vitro.</p>

<p>3'-Azido-3'-deoxythymidine-5'-monophosphate lithium salt - 100 mM aqueous solution is an azidothymidine (AZT) analog that inhibits HIV replication. AZT is a nucleoside reverse transcriptase inhibitor that blocks the progression of HIV by preventing the virus from duplicating its DNA. This product has been shown to be effective in treating AIDS and related diseases, as well as other infectious diseases such as hepatitis B and C. 3'-Azido-3'-deoxythymidine-5'-monophosphate lithium salt - 100 mM aqueous solution is often used in combination with other drugs to increase their efficacy. It has also been shown to be an effective chemotherapeutic agent against cancer cells.</p>

<p>2'-Deoxynucleoside-5'-triphosphate mixture are a group of phosphorylated compounds that are used in the synthesis of DNA. They are used as antiviral and anticancer agents, as well as activators for certain enzymes. They are also used to synthesize deoxyribonucleotides. The 2'-deoxynucleoside-5'-triphosphate mixture is purified and modified to produce high purity products for research purposes. These compounds have novel properties, making them suitable for creating new drugs with improved efficacy and reduced side effects.</p>

<p>6-Methylmercapto-9-(b-D-ribofuranosyl)purine (6MMPR) is a nucleotide analog that is synthesized through the process of ribosylation. It has been shown to be reactive and inflammatory in the colon, which may be due to its role as an enzyme inhibitor. 6MMPR inhibits target enzymes such as 2-methylthio-6-chloropurine riboside, which are involved in DNA synthesis and repair. This drug also has anti-inflammatory properties, which may be due to its ability to inhibit the production of inflammatory cytokines by activated immune cells. 6MMPR is used for the treatment of bowel diseases such as Crohn's disease and ulcerative colitis.</p>

<p>3-Iodo-1-(2-C-methyl-b-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine is a novel antiviral monophosphate nucleotide analog. It has been shown to be an effective activator of the enzyme ribonucleotide reductase, which is involved in DNA synthesis and repair. 3Iodo possesses anticancer activity, inhibiting the proliferation of cancer cells by interfering with DNA synthesis. The compound also inhibits tumor cell growth in vivo by inducing apoptosis. 3Iodo has been shown to inhibit HIV replication and may have potential as a treatment for HIV/AIDS.</p>

<p>2'-Deoxy-5-formylcytidine is a nucleoside analog that is used as a chemotherapeutic agent. It is cytotoxic to cells by binding to DNA and preventing the synthesis of DNA, RNA, and protein. The drug has been shown to induce cellular senescence in human fibroblasts, which can be reversed by the addition of deuterium. 2'-Deoxy-5-formylcytidine also inhibits the production of reactive oxygen species (ROS) by inducing the expression of antioxidant enzymes such as superoxide dismutase 2 and glutathione peroxidase 1. The oxidation products are misincorporated into DNA strands, leading to intramolecular hydrogen bonds with cytosine bases. These modifications lead to denaturation of DNA and inhibition of transcription and replication.<br>2'-Deoxy-5-formylcytidine also interacts with oligodeoxynucleotides, which leads to misinc</p>

<p>2’-Deoxy-5’-O-DMT-N2-isobutyrylguanosine-3’-(4-nitrophenoxyl)butanedioate is a novel antiviral drug that has been synthesized by coupling diphosphate and monophosphate nucleosides to an antiviral agent. The synthesis of this product is done through the use of activated 2,4,6,-trichlorobenzoyl chloride as a coupling agent. This product can be used in the treatment of cancer cells.</p>

<p>1-(2'-Deoxy-2'-fluoro-b-D-arabinofuranosyl)6-methylpurine is a synthetic nucleoside analog that has been shown to be an activator of DNA synthesis in mammalian cells. It has antiviral, anticancer, and antibiotic properties due to its ability to inhibit the growth of a variety of cancer cells. 1-(2'-Deoxy-2'-fluoro-b-D-arabinofuranosyl)6-methylpurine also inhibits viral replication by interfering with the replication machinery. This nucleoside analog is a modified form of 6MP and has high purity and quality.</p>

<p>2-Deoxy-2-Fluoro-a-D-arabinofuranosylamine is a novel antiviral agent that is synthesized from 2,4,6-trichlorobenzoyl chloride and 2,4,6-trifluorophenylglycine. It has been shown to be effective in inhibiting the replication of HIV and HSV types 1 and 2. This compound also has anticancer activity against colorectal cancer cells. The synthesis of this compound results in high purity with a high yield.</p>

<p>3’-b-Azido-2’,3’-dideoxy-5’-O-(4-methoxytrityl)uridine (AZDU) is a modified nucleoside that is used as an antiviral agent. AZDU inhibits viral DNA synthesis by acting as a competitive inhibitor of the enzyme ribonucleotide reductase. AZDU has also been shown to inhibit tumor cell growth in vitro and in vivo. In addition, AZDU has been found to have anticancer activity against human leukemia cells, which may be due to its ability to inhibit DNA synthesis.</p>

<p>2-Methylthioadenosine is a purine nucleoside which induces necrotic cell death. It is the first of its kind to be shown to have activity against squamous carcinoma cells, and is activated by nucleoside phosphorylase in order to produce its cytotoxic form. 2-Methylthioadenosine also inhibits the transcription-polymerase chain reaction and increases oxidative injury. This drug has been shown to have receptor activity in brain cells, as well as chemotactic activity for gland cells. 2-Methylthioadenosine has been used as a model organism for polymerase chain reactions, and has been shown to inhibit p2y receptors in the human colon cancer cell line HT29.</p>

<p>3',5'-Di-O-benzoyl-2'-deoxy-2',2'-difluorocytidine is a nucleoside analog, which is metabolized to its active form, 2',2'-difluoro-3'-O-methylcytidine. 3',5'-Di-O-benzoyl-2'-deoxy-2',2'-difluorocytidine has been shown to be a potent inhibitor of human tumor cell growth and is also effective in stimulating antitumor immunity. This drug binds to the DNA of cells and prevents transcription and replication.</p>

<p>2,3'-Anhydro-5'-O-tert-butyldimethylsilyl-N4-benzoyl-2'-deoxycytidine is an antiviral agent that is a synthetic nucleoside analogue. It acts as an activator of monophosphate and as a DNA phosphoramidite. 2,3'-Anhydro-5'-O-tert-butyldimethylsilyl-N4-benzoyl-2'-deoxycytidine has been shown to inhibit the growth of cancer cells and is being studied for its anticancer activity. This drug also inhibits ribonucleotide reductase, which prevents the conversion of ribonucleotides to deoxyribonucleotides, thereby inhibiting DNA synthesis.</p>

<p>N4-Acetyl-2'-deoxy-5'-O-DMT-5-methylcytidine 3'-CE phosphoramidite is a novel nucleoside and deoxyribonucleoside that has been synthesized by the chemical modification of cytidine. It is an anticancer drug and antiviral agent, which has been shown to activate DNA polymerase, inhibit RNA synthesis and have antiviral activities against HIV, HSV, CMV, and VZV. N4-Acetyl-2'-deoxy-5'-O-DMT-5-methylcytidine 3'-CE phosphoramidite has high purity with low impurities (0.1% DMSO), making it a valuable nucleoside for use in synthesis of ribonucleotide analogues.</p>

<p>1-(2'-Deoxy-2'-fluoro-b-D-arabinofuranosyl)-5-ethyluracil is a nucleoside analog with modifications to alter its biological activity. It contains a β-D-arabinofuranose sugar instead of the standard β-D-deoxyribose in natural nucleosides and<br>the fluorine (F) at the 2'-position increases resistance to enzymatic degradation and alters its biological activity. The 5-ethyl modification on the uracil ring enhances its interaction with viral polymerases.</p>

<p>5'-O-Acetyl-2',3'-dideoxy-2',3'-didehydro-5-fluorouridine is a nucleoside analog. It is synthesized by substituting the hydroxyl group of uridine with a fluorine atom and the 2' position of ribose with a 5'-O-acetyl group. This modification prevents the incorporation of this nucleoside into DNA or RNA, making it an effective antiviral and anticancer agent. 5'-O-Acetyl-2',3'-dideoxy-2',3'-didehydro-5-fluorouridine has been shown to be highly active against tumor cells but not normal cells in vitro.</p>