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- [5] Discovery of the HCVNS3/4A protease inhibitor (1R,5S)-N-[3-amino-1-(cyclobutylmethyl)-2,3-dioxopropyl]-3-[2(S)-[[[(1,1-dimethylethyl)amino]carbonyl]amino]-3,3-dimethyl-1-oxobutyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexan-2(S)-carboxamide (Sch 503034) II.: Key steps in structure-based optimization JOURNAL OF MEDICINAL CHEMISTRY, 2007, 50 (10) : 2310 - 2318