Synonyms: Ephenamine penicilline;(-)-Ephenamine penicillin G;Compenamine;l-Ephenamine penicillin G;4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3,3-dimethyl-7-oxo-6-((phenylacetyl)amino)- (2S-(2alpha,5alpha,6beta))-, compd.with (R-(R*,S*))-beta-(methylamino)-alpha-phenylbenzeneethanol (1 :1);4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3,3-dimethyl-7-oxo-6-((phenylacetyl)amino)-(2S-(2-alpha,5-alpha,6-beta))-, compd. with (R-(R*,S*))-beta-(methylamino)-alpha-phenylbenzeneethanol (1:1);(2S,5R,6R)-3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid - 2-(methylamino)-1,2-diphenylethanol (1:1)