4-Phenyl-1,2,4-triazaspiro[4.6]undec-1-ene-3-thione

In the title compound, C14H17N3S, the plane of the phenyl ring makes a dihedral angle of 74.90 (4)° with that of the triazathione ring (r.m.s. deviation = 0.001 Å), while the seven-membered ring adopts a twist-chair conformation. No specific intermolecular interactions are discerned in the crystal packing