c6h5co-

from The Collaborative International Dictionary of English v.0.48

Benzoyl \Ben"zoyl\, n. [Benzoic + Gr. ? wood. See {-yl}.]
   (Chem.)
   A compound radical, {C6H5.CO-}; the base of benzoic acid, of
   the oil of bitter almonds, and of an extensive series of
   compounds. [Formerly written also {benzule}.]
   [1913 Webster]