4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-((2,6-dimethoxybenzoyl)amino)-3,3-dimethyl-7-oxo-, monosodium salt, monohydrate, (2S-(2alpha,5alpha,6beta))- 61-32-5 7246-14-2 BRL 1241 Celbenin METHICILLIN SODIUM Methicillin sodium [USAN] Monosodium (2S,5R,6R)-6-(2,6-dimethoxybenzamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylate monohydrate SQ 16,123 Sodium methicillin Staphcillin X 1497