(2S,5R,6R)-6-[[(2-(Ethoxy-d5)-1-naphthalenyl)carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid Sodium Salt; Naftopen-d5; Naphthicillin-d5; Nafcil-d5; Sodium 6-(2-(ethoxy-d5)-1-naphthamido)penicillanate; 6-(2-(Ethoxy-d5)-1-naphthamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid Sodium Salt; 6-(2-(Ethoxy-d5)-1-naphthamido)penicillin Sodium Salt; BRL 1383-d5; Sodium Nafcillin-d5; Wy 3277-d5; Unipen; Sodium 6-(2-(ethoxy-d5)-1-naphthamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate;Nafcillin-d5 Sodium Salt