7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]-oct-2-ene-2-carboxylic acid,diphenylmethyl ester 、
DL-α-[[[(2,4-dioxo-1-imidazolidinyl)amino]carbonyl]amino]-2-thiopheneacetic acid 生成 7β-[[DL-[[[(2,4-dioxo-1-imidazolidinyl)amino]carbonyl]amino]-2-thienylacetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]-methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester