Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2-butoxy-1-naphthalenecarboxamido)-3,3-dimethyl-7-oxo-, monosodiumsalt (8CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-(2-butoxy-1-naphthamido)-3,3-dimethyl-7-oxo-, sodium salt (7CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[(2-butoxy-1-naphthalenyl)carbonyl]amino]-3,3-dimethyl-7-oxo-, monosodiumsalt, [2S-(2a,5a,6b)]-; BRL 1396