for the following products
(2R,6R,7R)-Benzhydryl 7-(4-methylbenzamido)-3-methylene-8-oxo-5-oxa-1-azabicyclo[4.2.0]octane-2-carboxylate and (2R,6R,7R)-3-methylene-7-[(4-methylbenzoyl)amino]-8-oxo-5-oxa-1-azabicyclo[4.2.0]octane-2-carboxylic acid diphenylmethyl ester