sodium(2S,5R,6R)-6-(2,6-dimethoxybenzamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate; (2S,5R,6R)-6-[(2,6-Dimethoxybenzoyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid Sodium Salt; Azapen; BRL 1241; Belfacillin; Celbenin; Sodium 6-(2',6'-dimethoxybenzamido)penicillanate; Penaureus; Sodium Methicillin; Staficyn; Staphcillin; Synticillin