(2S,5R)-6,6-dibromo-3,3-dimethyl-7-oxo-4-thia-1- azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide; 6,6-Dibromopenicillanic Acid S,S-Dioxide; 6,6-Dibromopenicillanic Acid 1,1-Dioxide; (2S,5R)-6,6-Dibromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide; Sulbactam Related Compound E (USP)