The chemical Penicillin G sodium has a designated molecular formula of C16H17N2NaO4S and a molecular weight of 356.372 g/mol. Synonyms may include: American penicillin, Benzylpenicillin sodium, Benzylpenicillin sodium salt, Benzylpenicillinic acid sodium salt, Crystapen, EINECS 200-710-2, Kesso-Pen, Mycofarm, Novocillin, NSC 402815, OK 431, Pen-A-Brasive (ChemID). Penicillin G sodium has been assigned a MeSH pharmacological action of: Antibacterial.