Synonyms: 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 N,N'-bis(phenylmethyl)-1,2-ethanediamine (2:1), tetrahydrate;N,N-dibenzylethane-1,2-diamine; (2S,5R,6R)-3,3-dimethyl-7-oxo-6-[(2-phenylacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid; tetrahydrate;Penicillin G benzathine (USP);Penicillin G benzathine tetrahydrate;