3,6-Bis(3,4,5-trimethoxy­phen­yl)-1,2,4-triazolo[3,4-b][1,3,4]thia­diazole

In the mol­ecule of the title compound, C(21)H(22)N(4)O(6)S, the planar central heterocyclic ring system is oriented with respect to the trimethoxy­phenyl rings at dihedral angles of 2.60 (5) and 3.60 (6)°. Intra­molecular C—H⋯N and C—H⋯S hydrogen bonds result in the formation of planar five- and six-membered rings. In the crystal structure, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules. There is a C—H⋯π contact between a methyl group and a trimethoxy­phenyl ring, and a π–π contact between the central heterocyclic ring system and a trimethoxy­phenyl ring [centroid–centroid distance = 3.640 (1) Å].