(2S,5R)-3,3-dimethyl-4,4,7-trioxo-4lambda6-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid; Sultamicillin - Impurity A (EP/BP); Sulbactam; (2S-cis)-3,3-Dimethyl-7-oxo-,4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid 4,4-Dioxide; Betamaze; CP 45899; Penicillanic Acid 1,1-Dioxide; Penicillanic Acid S,S-Dioxide; Penicillanic Acid Dioxide; Penicillanic Acid Sulfone (USP)