(6R,7S)-7-[[2-amino-2-(2-amino-1,3-thiazol-4-yl)acetyl]amino]-8-oxo-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 、
3,4-diacetoxy-benzoyl isocyanate 生成 (6R,7S)-7-[[2-(2-amino-1,3-thiazol-4-yl)-2-[(3,4-diacetyloxybenzoyl)carbamoylamino]acetyl]amino]-8-oxo-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid