Crystal structure of 3-[(E)-2-(4-phenyl-1,3-thia­zol-2-yl)hydrazin-1-yl­idene]indolin-2-one

In the title mol­ecule, C₁₇H₁₂N₄OS, the thia­zole ring forms a dihedral angle of 10.8 (2)° with the phenyl ring and an angle of 3.1 (3)° with the indole ring system [which has a maximum deviation of 0.035 (2) Å]. The dihedral angle between the planes of the phenyl ring and the indole ring system is 11.5 (1)°. An intra­molecular N—H...O hydrogen bond is observed. In the crystal, pairs of N—H...O hydrogen bonds form inversion dimers with an R²₂(8) graph-set motif.