benzyl-6-(3,5-bis-(3R,5R,6R)-3-benzyloxycarbonyl-penam-6-ylaminocarbonylmethoxy)-phenoxyacetamide-(3R,5,R,6R)-penam-6-ylcarboylate-1,1-dioxide
benzyl-6-(3,5-bis-(3r,5r,6r)-3-benzyloxycarbonyl-penam-6-ylaminocarbonylmethoxy)-phenoxyacetamide-(3r,5,r,6r)-penam-6-ylcarboylate-1,1-dioxide