Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-6-(5-methyl-3-phenyl-4-isoxazolecarboxamido)-7-oxo-,monosodium salt, monohydrate (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 3,3-dimethyl-6-[[(5-methyl-3-phenyl-4-isoxazolyl)carbonyl]amino]-7-oxo-,monosodium salt, monohydrate, [2S-(2a,5a,6b)]- (9CI); Oxacillin sodiumhydrate; Sodium oxacillin monohydrate; Stapenor sodium