7β-[(2-Hydroxybenzylidene)amino]-3-(hydroxymethyl)cepham-3-ene-4-carboxylic acid diphenylmethyl ester

(6R,7R)-3-Hydroxymethyl-8-oxo-7α-salicylideneamino-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester