Purines and Pyrimidine Derivatives

<p>Applications A labelled metabolite of Nicotinamide.<br>References Musfeld, C., et al.: J. Pharm. Biomed. Anal., 24, 391 (2001), Sakakibara, Y., et al.: Brain Res., 931, 68 (2002), Zielonka, J., et al.: Chem. Res. Toxicol., 19, 668 (2006), Wieczorkowska, M., et al.: Pharmacol. Rep., 59, 216 (2007),<br></p>

<p>Applications Febuxostat n-butyl Isomer is an impurity of Febuxostat (F229000) which is a xanthine oxidase/xanthine dehydrogenase inhibitor.<br>References Osada, Y., et al.: Eur. J. Pharmacol., 241, 183 (1993); Okamoto, K., et al.: J. Biol. Chem., 278, 1848 (2003); Mayer, M.D., et al.: Am. J. Therap., 12, 22 (2005); Tomlinson, B., et al.: Curr. Opin. Invest. Drugs, 6, 1168 (2005)<br></p>

<p>Applications An immunosuppressive drug used to treat leukemia. It is also used for pediatric non-Hodgkin’s lymphoma, polycythemia vera, and psoriatic arthritis.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Zeng, H., et al.: Biochem. Pharmacol., 68, 911 (2004),<br></p>

<p>Applications Caffeine-d3 (1-methyl-d3) (CAS# 26351-03-1) is a useful isotopically labeled research compound.<br></p>

<p>Applications Doxofylline is a xanthine molecule that appears to be both bronchodilator and anti-inflammatory with an improved therapeutic window over conventional xanthines such as Theophylline and the evidence supporting the effects of Doxofylline in the treatment of lung diseases.<br>References Franzone, J., et al.: Drugs Exp. Clin. Res., 14, 479 (1988), Nicholson, C., et al.: Pulm. Pharmacol., 7, 1 (1994), Sullivan, P., et al.: Lancet, 343, 1006 (1994),<br></p>

<p>Stability Hygroscopic<br>Applications A lactose adduct of Memantine (M218000). Intermediate in the synthesis of reducing carbohydrate Adamantane amines for use in treating Gram positive or Gram negative bacteria infections.<br>References Kustimur, et al.: Chinese Med. J., 116, 633 (2003),<br></p>

<p>Stability Hygroscopic<br>Applications 2-Amino-6-mercaptopurine-9-D-riboside Hydrate (cas# 345909-25-3) is a compound useful in organic synthesis.<br></p>

<p>Stability Hygroscopic<br>Applications Dihydro Caffeic Acid 3-O-β-D-Glucuronide is a glucuronide metabolite of Caffeic Acid (C080000).<br>References Clifford, M., et al.: J .Agric. Food Chem., 53, 3821 (2005), Lafay, S., et al.: J. Nutr., 136, 1192 (2006), Poquet, L., et al.: Drug Metab. Dispos., 36, 190 (2008)<br></p>

<p>Applications Intermediate in the production of Oseltamivir. It is a COVID19-related research product.<br>References Williams, M., et al.: Bioorg. Med. Chem. Lett., 7, 1837 (1997),<br></p>

<p>Applications A labelled metabolite of Allopurinol.<br>References Marro, P., et al.: Brain Res., 650, 9 (1994), Abramov, A., et al.: J. Neurosci., 27, 1129 (2007), Day, R., et al.: Clin. Pharmacokinet., 46, 623 (2007),<br></p>

<p>Applications This compound is used in the preparation of azidoalkanes. As well it is an intermediate in the synthesis of neuraminidase inhibitors.<br>References Braese, S. et al.: Sci. Synth. 41, 543 (2010); Jarinrat K. et al.: Bioorg. Med. Chem. Lett., 20, 2152 (2012);<br></p>

<p>Applications A metabolite of Nitrotyrosine (N597000), which is excreted in the urine.<br>References van der Vliet, A., et al.: J. Biol. Chem., 272, 7617 (1997), Tabrizi-Fard, M., et al.: Drug Metab. Dispos., 27, 429 (1999), Souza, J., et al.: Arch. Biochem. Biophys., 380, 360 (2000),<br></p>

<p>Impurity Naratriptan pyridinium Impurity<br>Stability Hygroscopic<br>Applications Naratriptan (N378730) impurity.<br></p>

<p>Applications 2,2,2-Trichloro-acetic Acid is an acetic acid analogue used for the precipitation of macromolecules including proteins, DNA and RNA as well as for cosmetic treatments.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Wiley D. et al.: Clin. Infect. Dis., 35m S210 (2002);<br></p>

<p>Impurity Allopurinol EP Impurity E / Allopurinol USP Related Compound E<br>Applications 3-(Formylamino)-1H-pyrazole-4-carboxylic Acid Ethyl Ester (Allopurinol EP Impurity E) is an impurity of Allopurinol (A547300), a pyrazole derivative that has been shown to induce neoplasm immunogenicity.<br>References Nicolin, A. et al.: Cancer, Chemother. Rep., 57, 3 (1973); Bonmassar, E. et al.: Cancer Res., 35, 1957 (1975)<br></p>

<p>Applications Nicotinic Acid-13C6 is labelled Nicotinic acid. It is a precursor of the coenzymes NAD and NADP. Widely distributed in nature; appreciable amounts are found in liver , fish, yeast and cereal grains. Dietary deficiency is associated with pellagra. The term “niacin” has also been applied to nicotinamide or to other derivatives exhibiting the biological activity of nicotinic acid. Vitamin (enzyme cofactor).<br>References Darby, W.J., et al.: Nutr. Rev., 33, 289 (1975), Black, A., et al.: Eur. J. Clin. Nutr., 54, 395 (2000), Cole, T., et al.: Br. Med. J., 320, 1240 (2000), Forshee, R., et al.: J. Nutr., 134, 2733 (2004),<br></p>

<p>Applications A degradation product of Nicotinic acid (N429250). An impurity of Nicotinic acid.<br>References Ensign, J., et al.: Biol. Chem., 239, 2285 (1964), Houghton, C., et al.: Biochem. J., 130, 879 (1972),<br></p>

<p>Applications Pirimiphos-methyl is a phosphorothioate used as an insecticide. Pirimiphos-methyl is commonly used for mosquito control as well as control of greenhouse crop pests and stored-product insects.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Deighton, J. et al.: Mosq. News, 34, 163 (1974); LaHue, D.W.: J. Econ. Entomol., 68, 236 (1975); Antonious, G.F. et al.: J. Entomol. Sci., 30, 191 (1995):<br></p>

<p>Stability Hygroscopic<br>Applications 7-Methyl Memantine is an impurity of Memantine (HCl salt, M218000) which is used as an antiparkinsonian and antispasmodic.<br>References Rohde, H., et al.: Fortschr. Med., 100, 2023 (1982), Kornhuber, J., et al.: Eur. J. Pharmacol., 166, 589 (1989), Gortelmeyer, R. and Erbler, H.: Arzneimittel-Forsch., 42, 904 (1992)<br></p>

<p>Applications Zolmitriptan (Z639000) impurity.<br></p>

<p>Applications Isotope labelled analog of Xanthine (X499950), a substance that can be found in animal organs, yeast, patatoes, coffee beans, tea. Xanthine can be used to relax and widen certain breathing passages of the lungs. It is also found that a large number of derivatives that exhibits adenoside receptor antagonist properties.<br>References Mueller, C. et. al: Handbook Exp. Pharmacol. 200,151(2011)<br></p>

<p>Applications A labelled metabolite of Theophylline.<br>References ottrup, A., et al.: Pharmacol. Toxicol., 67, 340 (1990), El-Kadi, A., et al.: Drug Metab. Dispos., 28, 1112 (2000), Kim, S., et al.: J. Med. Chem., 45, 2131 ( 2002), Hansel, T., et al.: Drugs Today, 40, 55 (2004),<br></p>

<p>Applications Caffeine-13C3 is a labelled analogue of Caffeine (C080100), a bitter, white crystalline xanthine alkaloid that acts as a stimulant drug and a reversible acetylcholinesterase inhibitor. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants. In humans, caffeine acts as a central nervous system stimulant, temporarily warding off drowsiness and restoring alertness. Caffeine is a cardiac and respiratory stimulant; diuretic. Caffeine is toxic at sufficiently high doses.A study at Johns Hopkins University indicates that caffeine can improve pattern separation memory.<br>References Zubair, U.M., et al.: Anal. Profiles Drug Subs., 15, 71 (1986); Cherrah, Y., et al.: Biochem. Pharmacol., 37, 1311 (1988);  Chem. and Eng. News p.34, Jan. 20, (2014)<br></p>

<p>Applications An aryl hydrazine used in the preparation of various dyes and pharmaceutical compounds. It is used in the investigation of oligosaccharides as well as the structure of photosystem II.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Lattova, E. et al.: Meth. Mol. Biol., 534, 65 (2009); Anderson, L.B. et al.: J. Biol. Chem., 275, 4920 (2000);<br></p>

<p>Applications Labelled Methotrexate (M260675) analog. DAMPA is an antitumor agent.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Martinelli, J.E., et al.: J. Med. Chem., 22, 869 (1979);<br></p>

<p>Impurity Methotrexate EP Impurity D<br>Applications N10-Methyl Pteroic Acid (Methotrexate EP Impurity D) is a Methotrexate (M260675) impurity D.<br>References Cramer, S., et al.: Cancer Res. 1984, 44, 1843 (1984), Hendel, J., et al.: Eur. J. Clin. Pharmacol., 26, 103 (1984),<br></p>

<p>Stability Hygroscopic<br>Applications Acetaldehyde 2,4-Dinitrophenylhydrazone is a dinitrophenylhydrazone (DNPH) derivative of an aliphatic alldehyde found in mainstream cigarette smoke. Dyes and metabolites.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Zwiener, C. et al.: Anal. Bioanal. Chem., 372, 615 (2002); Delgado, B. et al.: J. Liq. Chrom. Rel. Technol., 31, 361 (2008); Miller, J.H. et al.: J. Chrom. Sci., 48, 12 (2010);<br></p>

<p>Applications Ondansetron is a specific serotonin (5-HT3) receptor antagonist. Antiemetic.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Kris, M.G., et al.: J. Clin. Oncol., 6, 659 (1988); Faris, P..L., et al.: Lances, 355, 792 (2000)<br></p>

<p>Applications Xanthine oxidase/xanthine dehydrogenase inhibitor. Used for treatment of hyperuricemia and chronic gout. 40-120 mg/day febuxostat was proven effective in lowering serum urate levels when administered to manage hyperuricemia in patients with gout.<br>References Osada, Y., et al.: Eur. J. Pharmacol., 241, 183 (1993), Okamoto, K., et al.: J. Biol. Chem., 278, 1848 (2003), Mayer, M.D., et al.: Am. J. Therap., 12, 22 (2005), Tomlinson, B., et al.: Curr. Opin. Invest. Drugs, 6, 1168 (2005),<br></p>

<p>Applications Zeatin, purified from Zea mays, is a member of the cytokinin group of plant growth factors, the activity of which is attributed to its more stable trans form. Trans-Zeatin inhibits UVB-induced matrix metalloproteinase-1 expression via MAP kinase signaling in human skin fibroblasts. Trans-Zeatin is a potential agent for the management of skin photoaging.<br>References Murashige, T., et al.: Physiol. Plant, 15, 473 (1962), Brenneisen, P., et al.: J. Biol. Chem., 273, 5279 (1998), Choi, M., et al.: J. Dermatol. Sci., 46, 127 (2007), Bae, J., et al.: Food Chem. Toxicol., 46, 1298 (2008),<br></p>

<p>Impurity Ondansetron EP Impurity A/ Ondansetron USP Related Compound A<br>Applications 3-[(Dimethylamino)methyl]-1,2,3,9-tetrahydro-9-methyl-4H-carbazol-4-one (Ondansetron EP Impurity A) is an impurity of Ondansetron (O655000), an antiemetic.<br> Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package<br>References Mackinnon, J.W.M., et al.: Eur. J. Cancer Clin. Oncol., 25, 61 (1989);<br></p>

<p>Applications LY 368962 is a metabolite of the antifolate Pemetrexed (P219500).<br>References Woodland, J.M. et al.: Drug Metab. Dispos., 25, 693 (1997);<br></p>

<p>Applications Sulbutiamine (isobutyryl thiamine disulfide) is a lipophilic derivative of thiamine used for the treatment of asthenia and other related pathological conditions. Sulbutiamine is available over-the-counter in several countries as a component of nutritional supplements.<br>References Micheau, J., et al.: Pharmacol. Biochem. Behav., 23, 195 (1985), Bettendorff, L., et al.: Biochem. Pharmacol., 40, 2557 (1990), van Reeth, O., et al.: Drugs Today, 35, 187 (1999),<br></p>