China 3-OH 7-Phenylacetamido-3-Hydroxy-3-Cephem-4-Carboxylic Acid Diphenyl Methyl Ester Suppliers, China 3-OH 7-Phenylacetamido-3-Hydroxy-3-Cephem-4-Carboxylic Acid Diphenyl Methyl Ester Manufacturers.