Building Blocks

<p>Impurity Aspartame EP Impurity C<br>Applications L-Phenylalanine (Aspartame EP Impurity C) is an essential amino acid. L-Phenylalanine is biologically converted into L-tyrosine, another one of the DNA-encoded amino acids, which in turn is converted to L-DOPA and further converted into dopamine, norepinephrine, and epinephrine. L-Phenylalanine is produced for medical, feed, and nutritional applications such as in the preparation of Aspartame. Neuroprotective product.<br>References Hollunger, G. et al.: Acta Pharmacol. Toxicol., 34, 391 (1974); Bagchi, S.P. et al.: Biochem. Pharmacol., 26, 900 (1977);<br></p>

<p>Applications Phenylboronic Acid is a compound used in organic synthesis of various pharmaceutical goods.<br>References Ainley, A.D., et al.: J. Chem. Soc., 2171 (1930);<br></p>

<p>Applications Terephthalaldehyde (cas# 623-27-8) is a compound useful in organic synthesis.<br></p>

<p>Applications N4-[5-[[4-[[5-(Acetylhydroxyamino)pentyl]amino]-1,4-dioxobutyl]hydroxyamino]pentyl]-N1-[5-[[3-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-1-oxopropyl]amino]pentyl]-N1-hydroxybutanediamide, is a bifunctional chelator.<br></p>

<p>Applications Acetamide-2,2,2-d3 is used in infrared spectral studies and normal vibrations of acetamide and it’s deutrated analogs.<br>References Suzuki, I., et al.: Bull. Chem. Soc. of Jpn., 35, 1279 (1962); Knudsen, R., et al.: J. Mol. Struct., 321, 187 (1994)<br></p>

<p>Applications An oxazole derivative used as an antibiotic. It is also used in the preparation of compounds with antitumor activity. A metabolite of Furazolidone (F864100).<br>References Miyahara, M. et al.: CHem. Pharmac. Bull., 29, 2366 (1981); Hunder, G. et al.: Arch. Toxicol., 61, 161 (1987); Roloff, T. et al.: Med. Monat. Pharrm., 22, 370 (1999);<br></p>

<p>Applications DL-Homocysteine is an allosteric antagonist at the dopamine d2 receptors. Mainly, L-Homocysteine (H591950) exists naturally and is recycled into methionine or converted into cysteine.<br>References Agnati, L. et al.: J. Proteome Res. 5, 3011 (2006); Stipanuk, M. et al.: Ann. Rev. Nutrition., 24, 539 (2004);<br></p>

<p>Applications N-Boc-propargylamine is used in the preparation of triazolobenzylidene-thiazolopyrimidines which act as CDC25 phosphatase inhibitors. Also used in the synthesis of β-glucan polysaccharide analogs.<br>References Duval, R. et al.: J. Comb. Chem., 11, 947 (2009); Tanaka, H. et al.: Tetrahedron Lett., 53, 4104 (2012);<br></p>

<p>Applications One of the alkyl ethers with tert-Bu groups in their molecules which showed very poor biodegradability, tert-Bu Me ether (MTBE)  [1634-04-4] had no effect on the biodegradability of gasoline blended with it. Studies on the biodegradation of several alkyl ethers were carried out by measuring the O uptake rate in the presence of standard activated sludge as a source of microorganisms.<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 Siegemund, B., et al.: Acute Toxicity Data, 1, 200 (1992),<br></p>

<p>Impurity Ipratropium EP Impurity D<br>Stability Light Sensitive<br>Applications Atropic acid (Ipratropium EP Impurity D) is an impurity of Ipratropium bromide (I740500) and Atropine Sulfate (A794625).<br>References Lyon, R., et al.: J. Pharm. Sci., 95, 1549 (2006), Loch, M., et al.: Toxicology, 233, 229 (2007), John, H., et al.: Anal. Bioanal. Chem., 396, 751 (2010),<br></p>

<p>Applications dl Homocysteine Thiolactone Hydrochloride (cas# 6038-19-3) is a compound useful in organic synthesis.<br>Chemical Name: dl Homocysteine Thiolactone Hydrochloride (cas# 6038-19-3) is a compound useful in organic synthesis.<br></p>

<p>Applications An intermediate in the metabolism of tyrosine and phenylalanine. Occurs in plants and in the urine of alkaptonurics.<br>References Knox, W.E., et al.: Biochem. J., 49, 686 (1951), LaDu, B.N., et al.: J. Biol. Chem., 217, 777 (1955)<br></p>

<p>Applications 2-Bromo-2-phenylacetic acid<br></p>

<p>Applications Pyruvaldehyde is used in the synthesis and cytotoxicity evaluation of N-terminal analogues of tubulysin-U an antimitotic compound. Also used in the synthesis of imidazoles as potent calcitonin gene-related CGRP antagonists.<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 Shankar, S. et al.: Tetrahedron Lett., 54, 6137 (2013); Tora, G. et al.: Bioorg. Med. Chem. Lett., 23, 5684 (2013);<br></p>

<p>Stability Air Sensitive, Hygroscopic<br>Applications 1-Thioglycerol is generally used as a size-regulating capping agent for nanocrystals. 1-Thioglycerol is also used in bacteriology experiments to induce the synthesis of porphyrin compounds in aerobically growing Escherichia coli.<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 Harrison, M., et al.: Adv. Mater., 12, 123 (2000); Javor, G. &amp; Febre, E.: J. Bacteriol., 174, 1072 (1992); Wang, Y., et al.: J. Raman Spectrosc.,38, 34 (2007)<br></p>