4-{3-[(2-Isopropyl-5-methylphenoxy)methyl]-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazin-6-yl}-3-(p-tolyl)sydnone

In the title triazolothiadiazin compound, C(24)H(24)N(6)O(3)S (systematic name: 4-{3-[(2-isopropyl-5-methylphenoxy)methyl]-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazin-6-yl}-3-(4-methylphenyl)-1,2,3-oxadiazol-3-ium-5-olate), an intramolecular C-H center dot center dot center dot O hydrogen bond generates an S(6) ring motif. The two terminal methyl groups of the isopropyl unit are disordered over two sets of positions in a 0.715 (4):0.285 (4) ratio. The mean planes formed through the major and minor disordered isopropyl units are inclined at interplanar angles of 73.1 (4) and 86.6 (8)degrees, respectively, with the attached phenyl ring. The 3,6-dihydro-1,3,4-thiadiazine ring adopts a twist-boat conformation. The interplanar angle formed between 1,2,3-oxadiazole and 1,2,4-triazole rings is 18.80 (11)degrees. In the crystal, neighbouring molecules are linked into sheets lying parallel to the bc plane by C-H center dot center dot center dot N hydrogen bonds. Weak intermolecular pi-pi interactions [centroid-centroid distances = 3.2935 (11) and 3.5590 (12) angstrom] further stabilize the crystal structure.