(1R)-3-(4-吗啉)-3-氧代-1-((苯基磺酰基)甲基)丙基氨基甲酸苄酯

(R)-3-(benzyloxycarbonylamino)-4-hydroxybutanoic acid

(R)-methyl 3-(benzyloxycarbonylamino)-4-(phenylthio)butanoate