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Abacavir-d4 is intended for use as an internal standard for the quantification of abacavir by GC- or LC-MS. Abacavir is a nucleoside analog and an inhibitor of HIV-1 reverse transcriptase (Ki = 2.1 μM for the wild-type enzyme).1 It inhibits replication of a variety of HIV-1 and HIV-2 strains, including strains resistant to 3'-azido-3'-deoxythymidine or 2',3'-dideoxyinosine , in HeLa cells stably expressing CD4 (IC50s = 5.8-21 μM). Abacavir inhibits replication of eight HIV-1 clinical isolates in phytohemagglutinin-stimulated isolated human peripheral blood lymphocytes with a mean IC50 value of 0.26 μM. It inhibits hepatitis B virus (HBV) DNA synthesis in HepG2 cells (IC50 = 7 μM) and is also active against human cytomegalovirus (CMV) strain AD169 and the Petaluma strain of feline immunodeficiency virus (FIV) in plaque reduction assays (IC50s = 32 and 0.4 μM, respectively). Formulations containing abacavir have been used in the treatment of HIV infection.

1.Daluge, S.M., Good, S.S., Faletto, M.B., et al.1592U89, a novel carbocyclic nucleoside analog with potent, selective anti-human immunodeficiency virus activityAntimicrob. Agents Chemother.41(5)1082-1093(1997)

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