(2S,5R,6R)-6-[[(2-Ethoxy-1-naphthalenyl)carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid Sodium Salt; Naftopen; Naphthicillin; 6-(2-Ethoxy-1-naphthamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid Sodium Salt; 6-(2-Ethoxy-1-naphthamido)penicillin Sodium Salt; BRL 1383; Nafcil; Sodium 6-(2-ethoxy-1-naphthamido)penicillanate; Unipen; Sodium 6-(2-ethoxy-1-naphthamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate; Sodium Nafcillin; Wy 3277;Nafcillin Sodium Salt