N-(叔丁氧羰基L)-S-甲基-L-半胱氨酸 、 (R)-N-tert-butyl-3-<(2S,3S)-3-amino-2-hydroxy-4-phenylbutanoyl>-1,3-thiazolidine-4-carboxamide 在
N-hydroxy-5-norbornene-2,3-dicarboximide O-(diphenyl phosphate) 作用下,
生成 (R)-N-tert-butyl-3-[(2S,3S)-3-[(S)-2-(tert-butoxycarbonyl)amino-3-methylthiopropionyl]amino-2-hydroxy-4-phenylbutanoyl]-1,3-thiazolidine-4-carboxamide