4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6,6-dibromo-3,3-dimethyl-7-oxo-, 4,4-dioxide, (2S-cis)-;6,6-Dibromopenicillanic acid 1,1-dioxide; 6,6-Dibromopenicillanic acidS,S-dioxide
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