2-Benzoyl-1,1-diethyl-3-phenylguanidine

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In the title tetrasubstituted guanidine, C18H21N3O, the guanidine and carbonyl groups are not coplanar, as reflected by the torsion angles involving the N=C atoms [17.6 (3), −141.68 (17) and 42.2 (3)°]. This is probably due to the absence of an intra­molecular N—H⋯O hydrogen bond, forming a six-membered ring, and is commonly observed in this class of compounds. In the crystal structure, centrosymmetric dimers are formed via pairs of inter­molecular N—H⋯O hydrogen bonds. The dihedral angles between the guanidine plane and the phenyl ring and benzoyl plane are38.06 (9) and 41.54 (7)°, respectively.