methyl (5S,2Z)-5-benzyloxycarbonylamino-2-t-butoxycarbonylamino-6-hydroxy-2-hexenoate

methyl (5S,2Z)-4-(3-benzyloxycarbonyl-2,2-dimethyl-1,3-oxazolidin-4-yl)-2-t-butoxycarbonylamino-2-butenoate