amprenavir [ 141W94,Agenerase,Glaxo Wellcome brand of amprenavir,GlaxoSmithKline brand of amprenavir,VX 478,VX-478,Vertex VX478,tetrahydro-3-furyl N-(3-(4-amino-N-isobutylbenzenesulfonamido)-1-benzyl-2-hydroxypropyl)carbamate ] structure in first source; RN refers to (3S-(3R*(1S*,2R*)))-isomer; fosamprenavir is a prodrug