Experimental

disorder in main residue; R factor = 0.061; wR factor = 0.133; data-to-parameter ratio = 8.3. In the title 1,2,4-triazine derivative, C17H19N3O3, the hetero-cyclic 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. 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 intramolecular C—H O contact. Chains are connected into a supramolecular layer in the ac plane by – interactions [ring centroid–centroid distance = 3.488 (3) Å]. The central atom in the –CH2CH2C(H) residue of the cyclohexene ring is disor-dered over two sites, with the major component having a site-occupancy factor of 0.51 (2). Related literature For the potential medicinal applications of 1,2,4-triazines, see