methyl 2-((2R,3S)-2-(acetylthio)-4-oxo-3-(2-phenylacetamido)azetidin-1-yl)-2-(triphenyl-l⁵-phosphanylidene)acetate

2-氨基-5-甲基噻唑-4-甲酸甲酯

[(2R)-2r-acetylsulfanyl-4-oxo-3c-(2-phenoxy-acetylamino)-azetidin-1-yl]-(triphenyl-λ5-phosphanylidene)-acetic acid methyl ester

甲基2-甲酰氨基-3-氧代丁酸酯

2-diazonio-1-methoxy-3-oxobut-1-en-1-olate