Chalepensin, a furanocoumarin isolated from the rutaceae plant Ruta chalepensis L., is a selective CYP2A6 inhibitor, inhibiting CYP1A1, CYP1A2, CYP2A13, CYP2C9, CYP2D6, CYP2E1, and CYP3A4.Chalepensin exhibits Chalepensin j has antiprotozoal activity and inhibits methicillin-resistant Staphylococcus aureus (MRSA) with MIC values in the range of 32-128 μg mL.