A compound radical, C6H5.CO-; the base of benzoic acid, of the oil of bitter almonds, and of an extensive series of compounds.

In organic chemistry, benzoyl is the acyl of benzoic acid, with structure C6H5CO-. It should not be confused with benzyl, which is the radical or ion formed from the removal of one of the methyl hydrogens of toluene (methylbenzene). Whereas a benzyl substituent is commonly abbreviated "Bn", a benzoyl group is in contrast given the symbol "Bz".

peroxide: A topical ointment with an antibacterial effect. It also has a mild drying effect.