(4-nitrophenyl)methyl 2-[(2R,3S)-2-[3-[2-[(4-nitrophenyl)methoxycarbonylamino]ethylsulfanyl]-2-oxopropyl]-3-[(1R)-1-[(4-nitrophenyl)methoxycarbonyloxy]ethyl]-4-oxoazetidin-1-yl]-2-(triphenyl-λ5-phosphanylidene)acetate 生成
p-Nitrobenzyl (5R,6S)-3-(2-p-nitrobenzyloxycarbonylaminoethyl)thiomethyl-6-[1-(R)-p-nitrobenzyloxycarbonyloxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate