for the following products
(6R,7R)-3-(Chloromethyl)-7-[[(1,1-dimethylethoxy)carbonyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid diphenylmethyl ester and Diphenylmethyl 7beta-tert-butoxycarbonylamino-3-chloromethyl-3-cephem-4-carboxylate
