(4-nitrophenyl)methyl (6R,7R)-3-[(1-ethyl-7-methyl-4-oxo-1,8-naphthyridine-3-carbonyl)oxymethyl]-5,8-dioxo-7-[(2-phenoxyacetyl)amino]-5λ4-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate 生成
(6R,7R)-3-[(1-ethyl-7-methyl-4-oxo-1,8-naphthyridine-3-carbonyl)oxymethyl]-8-oxo-7-[(2-phenoxyacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid