(1α)-4-(Chloromethyl)-7-oxo-8β-amino-2-thia-6-azabicyclo[4.2.0]octa-4-ene-5-carboxylic acid 4-methoxybenzyl ester;(6R,7R)-7-Amino-3-chloromethyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-methoxybenzyl ester;3-(Chloromethyl)-7β-aminocepham-3-ene-4-carboxylic acid 4-methoxybenzyl ester
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