The chemical Penicillin G potassium has a designated molecular formula of C16H17KN2O4S and a molecular weight of 372.480 g/mol. Synonyms may include: Benzylpenicillin potassium, Benzylpenicillin potassium salt, Benzylpenicilline potassique [DCF], Benzylpenicillinic acid potassium salt, Capicillin, Cillin, C-Cillin, Cilloral potassium salt, Cintrisul, Cosmopen potassium salt, Cristapen, EINECS 204-038-0 (ChemID). Penicillin G potassium has been assigned a MeSH pharmacological action of: Antibacterial.