N-?[(S)?-?(4-?Nitrophenoxy)?phenoxy-?2,?3,?4,?5,?6-?d5-?phosphinyl]?-?L-?Alanine-d5 1-?Methylethyl Ester is an intermediate in synthesizing PSI-7977-D5 (P839643), an isotope labelled analog of PSI-7977. PSI-7977 is a prodrug that is metabolized to the active antiviral agent 2'-deoxy-2'-α-fluoro-β-C-methyluridine-5'-monophosphate and is currently being investigated in phase 3 clinical trials for the treatment of hepatitis C. Studies have profiled PSI-7977 as a nucleotide inhibitor of hepatitis C virus, exerting selective inhibitory effects towards HCV NS5B polymerase.
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