2-[(Cyclo-hex-3-en-1-ylmeth-oxy)meth-yl]-6-phenyl-1,2,4-triazine-3,5(2H,4H)-dione.

In the title 1,2,4-triazine derivative, C(17)H(19)N(3)O(3), the heterocyclic ring is planar (r.m.s. deviation = 0.040 Å) and effectively coplanar with the adjacent phenyl ring [dihedral angle = 4.5 (2)°] but almost perpendicular to the (cyclo-hex-3-en-1-ylmeth-oxy)methyl residue [N-N-C-O torsion angle = 71.6 (5)°], so that the mol-ecule has an 'L' shape. Supra-molecular chains along [001] are formed in the crystal via N-H⋯O hydrogen bonds where the acceptor O atom is the ether O atom. The adjacent carbonyl O atom forms a complementary C-H⋯O contact resulting in the formation of a seven-membered {⋯HNCO⋯HCO} heterosynthon; the second carbonyl O atom forms an intra-molecular C-H⋯O contact. Chains are connected into a supra-molecular layer in the ac plane by π-π inter-actions [ring centroid-centroid distance = 3.488 (3) Å]. The central atom in the -CH(2)CH(2)C(H)= residue of the cyclo-hexene ring is disordered over two sites, with the major component having a site-occupancy factor of 0.51 (2).