Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-(2-phenylacetamido)-, calcium salt (2:1) (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]- (2S,5R,6R)-, calcium salt (2:1)(9CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]-[2S-(2a,5a,6b)]-, calcium salt (2:1);Benzylpenicillin calcium; Benzylpenicillinic acid calcium salt; Calciumbenzylpenicillin; Calcium benzylpenicillinate; Calcium penicillin G; PenicillinG calcium