(2R,3R)-2-Isopropyl-1,1-dioxidotetrahydro-3-thienyl ((1S,2R)-1-benzyl-3-{(2S)-2-[(tert-butylamino)carbonyl]-4-[(6-methylpyridin-3-yl)methyl]piperazin-1-yl}-2-hydroxypropyl)carbamate AIDS-032521 AIDS032521 L-735,524 analog N-(Pyrid-Me)Piperaz, thienyl urethane deriv.