(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 6-(2-Ethoxy-1-naphthamido)penicillin sodium salt
(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 6-(2-Ethoxy-1-naphthamido)penicillin sodium salt