(3S,4aS,8aS,2'R,3'S,4R,3aR,6aS)-N-tert-Butyl-2-[2'-hydroxy-4'-phenyl-3'-[[[(3-hexahydro-2H-cyclopenta[b]furanyl)oxy]carbonyl]amino]butyl]decahydroisoquinoline-3-carboxamide AIDS-028265 AIDS028265 IsoquinCON c-Pen-Thf Urethane analog