Methyl (2S)-2-{[3,5-bis(trifluoromethyl)phenyl]sulphonamido}-4-(methylsulphanyl)butanoateMethyl (2S)-2-({[3,5-bis(trifluoromethyl)phenyl]sulphonyl}amino)-4-(methylthio)butanoate 97%Methyl (2S)-2-{[3,5-bis(trifluoromethyl)phenyl]sulphonamido}-4-(methylthio)butanoateN-{[3,5-Bis(trifluoromethyl)phenyl]sulphonyl}-L-methionine methyl ester