Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2-ethoxy-1-naphthamido)-3,3-dimethyl-7-oxo-, monosodium salt (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[(2-ethoxy-1-naphthalenyl)carbonyl]amino]-3,3-dimethyl-7-oxo-, monosodium salt,(2S,5R,6R)- (9CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[(2-ethoxy-1-naphthalenyl)carbonyl]amino]-3,3-dimethyl-7-oxo-, monosodiumsalt, [2S-(2a,5a,6b)]-;6-(2-Ethoxy-1-naphthamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid sodium salt; 6-(2-Ethoxy-1-naphthamido)penicillin sodium salt; BRL 1383;Nafcil; Nafcillin sodium; Nafcillin sodium salt; Naftopen; Naphthicillin;Sodium6-(2-ethoxy-1-naphthamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate;Sodium 6-(2-ethoxy-1-naphthamido)penicillanate; Sodium nafcillin; Unipen; Wy3277