(R)-7-Amino-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
2,2,3-trichloro-3-phenyl-propionaldehyde
methanol
(R)-3-(1-Methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-7-[2,2,3-trichloro-3-phenyl-prop-(E)-ylideneamino]-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester