2-[(Cyclo­hex-3-en-1-ylmeth­oxy)meth­yl]-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 (cyclo­hex-3-en-1-ylmeth­oxy)methyl residue [N—N—C—O torsion angle = 71.6 (5)°], so that the mol­ecule has an ‘L’ shape. Supra­molecular 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 intra­molecular C—H⋯O contact. Chains are connected into a supra­molecular layer in the ac plane by π–π inter­actions [ring centroid–centroid distance = 3.488 (3) Å]. The central atom in the –CH(2)CH(2)C(H)= residue of the cyclo­hexene ring is disordered over two sites, with the major component having a site-occupancy factor of 0.51 (2).