benzylpenicillin PubChem:5904 Benzylpenicillin, commonly referred to as penicillin G, is effective against both Gram-positive and Gram-negative bacteria. It is unstable in acid. ARO:3000632 antibiotic_resistance CAS:61-33-6 benzopenicillin ChEBI:18208 ChEMBL:CHEMBL29 Penicillin G beta-lactamase sensitive penicillin