上游原料
2-amino-2-(3,4-dihydroxyphenyl)acetic acid4-ethyl-2,3-dioxo-1-piperazinecarbonyl chloride2-(3,4-dihydroxyphenyl)-2-[[(4-ethyl-2,3-dioxo-1-piperazinyl)carbonyl]amino]acetic acid2-[Bis(methoxycarbonyl)phenyl]-2-(4-ethyl-2,3-dioxopiperazin-1-ylcarboxamido)acetic acidphenethyl (2S,6S)-6-amino-6-(formylamino)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylatephenethyl (2S,6R)-6-(formylamino)-3,3-dimethyl-7-oxo-6-[[(3,3,3-trichloropropanoyl)oxy]amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate6(S)-[2-[3,4-Bis(methoxycarbonyl)phenyl]-2-(4-ethyl-2,3-ddioxopiperazin-1-ylcarboxamido)acetamido]-6-(formamido)-2,2-dimethylpenam-3(S)-carboxylic acid benzyl ester; 6(S)-[2-[3,4-Bis(methoxycarbonyl)phenyl]-2-(4-ethyl-2,3-ddioxopiperazin-1-ylcarboxamido)acetamido]-6-(formamido)-2,2-dimethylpenam-3(S)-carboxylic acid benzyl ester6(S)-[2-[3,4-Bis(methoxycarbonyl)phenyl]-2-(4-ethyl-2,3-ddioxopiperazin-1-ylcarboxamido)acetamido]-6-(formamido)-2,2-dimethylpenam-3(S)-carboxylic acid; 6(S)-[2-[3,4-Bis(methoxycarbonyl)phenyl]-2-(4-ethyl-2,3-ddioxopiperazin-1-ylcarboxamido)acetamido]-6-(formamido)-2,2-dimethylpenam-3(S)-carboxylic acid
