5-THIA-1-AZABICYCLO[4.2.0]OCTANE-2-CARBOXYLIC ACID, 7-[[5-(DIPHENYLMETHOXY)-1,5-DIOXOPENTYL]AMINO]-3-[(METHYLSULFONYL)OXY]-8-OXO-, DIPHENYLMETHYL ESTER, (6R,7R)-
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