. "a penicillin that is similar in antibiotic action to penicillin G but is obtained differently"@en-us . "103910887"^^ . . "penicillin O"@en-us . "103763269"@en-us . "0"^^ . . "0"^^ . . . . . . . . "penicillin O"^^ . "03910887-n"^^ .