(E)-3-(1-Phenyl-ethyl-idene)indolin-2-one.

In the title mol-ecule, C(16)H(13)NO, the indoline-2-one ring system is nearly planar [maximum atomic deviation = 0.082†(2)†à ] and is oriented at a dihedral angle of 66.60†(12)° with respect to the phenyl ring. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into supra-molecular dimers.