European Pharmacopoeia (EP) Reference Standard Synonym(s): Sulbactam; (2S,5R)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide; Betamaze; CP 45899; CP-45,899; Penicillanic acid 1,1-dioxide; Penicillanic acid S,S-dioxide; Penicillanic acid dioxide; Penicillanic acid...