Benzhydryl 6,6-dihydropenicillic acid 1-oxide,(2S,5R)-Benzhydryl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4-oxide

Benzhydryl 6,6-dihydropenicillic acid 1-oxide,(2S,5R)-Benzhydryl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4-oxide

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