(S)-4-((4-Cyanophenyl)amino)-4-oxo-3-((trifluoroacetyl)amino)butanoic acid 39219-30-2 BRN 2779992 BUTANOIC ACID, 4-((4-CYANOPHENYL)AMINO)-4-OXO-3-((TRIFLUOROACETYL)AMINO)-, (S)- L-4'-Cyano-3-(2,2,2-trifluoroacetamido)succinanilic acid