4-Amino-N-((2R,3R)-3-amino-2-hydroxy-4-phenylbutyl)-N-isobutylbenzenesulfonamide-d9 Bis(2,2,2-trifluoroacetate) is the labeled analogue of 4-Amino-N-((2R,3R)-3-amino-2-hydroxy-4-phenylbutyl)-N-isobutylbenzenesulfonamide Bis(2,2,2-trifluoroacetate) (A581390), an intermediate in the synthesis of 1-epi-Darunavir (D193505), a stereoisomer to Darunavir (D193500), a second generation HIV-1-protease inhibitor; structurally similar to amprenavir. Antiviral.