for the following products
(6R,7R)-4-Methoxybenzyl 7-amino-3-(chloromethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate hydrochloride | 7-Amino-3-(chloromethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-3-ene-4-carboxylic acid (4-methoxyphenyl)methyl ester hydrochloride and 7-Amino-3-chloromethyl-3-cephem-4-carboxylic acid p-methoxybenzyl ester hydrochloride
