8-Methyl-3-methylsulfanyl-8a,8b-dihydro-5 H -1-oxa-2,4-diazaacenaphthylene

In the tricyclic title compound, C 11 H 12 N 2 OS, the 2,3,4,5-tetrahydropyridine ring adopts a half-chair conformation. This ring makes dihedral angles of 27.72 (7) and 45.17 (7)°, respectively, with the isoxazole and the cyclohexa-1,3-diene rings while the isoxazole ring is oriented at an acute angle of 63.46 (7)° with respect to the cyclohexa-1,3-diene ring. In the crystal, molecules associate via C—H...N hydrogen bonds and C—H...π interactions, forming a three-dimensional network.