4-[3-(1-Naphthyl-oxymeth-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thia-diazin-6-yl]-3-p-tolyl-sydnone.

In the title sydnone compound, C(24)H(18)N(6)O(3)S {systematic name: 4-[3-(1-naphthyl-oxymeth-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thia-diazin-6-yl]-3-p-tolyl-4,5-dihydro-1,2,3-oxadiazol-3-ium-5-olate} an intra-molecular C-H⋯O hydrogen bond generates an S(6) ring motif. The 3,6-dihydro-1,3,4-thia-diazine ring adopts a twist-boat conformation. The essentially planar 1,2,3-oxadiazole and 1,2,4-triazole rings [maximum deviations of 0.006 (1) and 0.008 (1) Å, respectively] are inclined to one another at inter-planar angle of 44.11 (4)°. The naphthalene unit forms an inter-planar angle of 66.40 (4)° with the 1,2,4-triazole ring. In the crystal packing, pairs of inter-molecular C-H⋯O hydrogen bonds link adjacent mol-ecules into dimers incorporating R(2) (2)(12) ring motifs. Further stabilization is provided by weak C-H⋯π inter-actions.