7-amino-3-<(3,4-dihydoxyphenyl)methyl>ceph-3-em-4-carboxylic acid 生成 (6R,7R)-3-[(3,4-dihydroxyphenyl)methyl]-7-[[(2R)-2-[(4-ethyl-2,3-dioxopiperazine-1-carbonyl)amino]-2-(4-hydroxyphenyl)acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid