Penicillin G, or benzylpenicillin, is a β-lactam antibiotic effective against Gram-positive and some Gram-negative bacteria. It inhibits peptidoglycan cross linking in cell wall synthesis by binding to penicillin binding proteins.
White to off-white
H2O: 100 mg/mL DMSO: 71 mg/mL at 25°C Ethanol: <1 mg/mL at 25°C. Soluble in alcohol and glycerol.