Benzhydryl (2R-(1(E),2alpha,3alpha))-alpha-(1-methoxyethylidene)-4-oxo-3-((phenoxyacetyl)amino)-2-(((p-tolyl)sulphonyl)thio)azetidine-1-acetate;diphenylmethyl (2E)-3-methoxy-2-{(2R)-2-{[(4-methylphenyl)sulfonyl]sulfanyl}-4-oxo-3-[(phenoxyacetyl)amino]azetidin-1-yl}but-2-enoate
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