Nucleosides and Nucleotides

Gemcitabine hydrochloride (LY 188011 hydrochloride) is a synthetic cytosine nucleoside derivative and an inhibitor of DNA synthesis.

Remdesivir impurity 6 is an impurity standard for a research and development drug product. It is a synthetic compound that has been custom synthesized for use in pharmacopoeia drug products. The purity of this compound is high and it has been shown to have no toxic effects on metabolism studies. Remdesivir impurity 6 is a metabolite of remdesivir, which is used as an antiviral agent for the treatment of HIV infection.

Applications Nitrogen 15 labelled analogue of Adenosine (A280400), a purine nucleoside that plays an important role in various biochemical processes. References Long, X., et al.: J. Pharmacol. Exper. Ther., 335, 781 (2010); Ham, M., et al.: J. Pharmacol. Exper. Ther., 335, 607 (2010)

4-Dehydroxy-4-dimethylhydroxysilyl entecavir is an impurity standard for the drug product Entecavir. It is a synthetic drug that inhibits the production of human immunodeficiency virus (HIV) by binding to reverse transcriptase and blocking its activity. The metabolite of 4-dehydroxy-4-dimethylhydroxysilyl entecavir, entecavir, is also used as a treatment for HIV. Synthetic 4-dehydroxy-4-dimethylhydroxysilyl entecavir is used in clinical trials as a drug product and metabolite of entecavir to measure the concentration of the active ingredient in plasma and other body fluids. 4DDSILENT has been shown to have antiviral properties against HIV due to its ability to inhibit transcriptional activation by binding to reverse transcriptase, which prevents RNA from being synthesized into DNA.

4-Amino-1-[3,5-di-O-(4-chlorobenzoyl)-2-deoxy-α-D-ribofuranosyl]-1,3,5-triazin-2(1H)-one (4AAT) is an analytical chemical that is used for research and development purposes. 4AAT is a metabolite of the antibiotic ampicillin and has been identified as an impurity in the drug product. It can be synthesized from 2-(4'-chlorophenyl)benzaldehyde, 3,5'-di-O-(4'-chlorobenzoyl)-2',3'-dideoxyribose and sodium azide in a two step process with 98% purity. 4AATs are also found to be present in natural products such as honey or sugar cane juice.

Stability Hygroscopic Applications 5-Methylcytidine is a derivative of Cytidine (C998300), found in ribonucleic acids of animals, plants and bacteria. 5-Methylcytidine is a nucleoside found in liver emulsion that can inhibit the growth of spontaneous tumors of mammary gland origin in mice. 5-Methylcytidine is one of many nucleosides that can be used as biomedical marker using liquid chromatography and ion trap mass spectrometry coupling. References Kammerer, B., et al.: Anal. Biol. Chem., 382, 1017 (2005); Strong, L. and Matsunaga, H.: J. Surg. Oncol., 4, 528 (1972)

Intermediate in the synthesis of ribavirin

Cytarabine (Ara-C) is a nucleoside analog, an inhibitor of DNA synthesis (IC50=16 nM).

N6-(2-Phenylethyl)adenosine (N6-Phenethyladenosine) is an adenosine derivative and an agonist of adenosine receptors with Ki values of 11.8 nM and 30.1 nM for

This protein is a serine beta-lactamase with a substrate specificity for cephalosporins.

CAS No. 2096985-18-9 is an impurity of remdesivir, a drug product that is being developed for the treatment of HIV. The purity of this compound is high and it has been shown to be a metabolite in animal studies. Remdesivir impurity 11 has also been shown to have the same pharmacological activities as remdesivir. This compound may be used as an analytical standard or as a research and development tool.