Mol­ecular and crystal structure of 5,9-dimethyl-5H-pyrano[3,2-c:5,6-c′]bis­[2,1-benzo­thia­zin]-7(9H)-one 6,6,8,8-tetroxide di­methyl­formamide monosolvate

The title mol­ecule crystallizes as a di­methyl­formamide monosolvate, C(19)H(14)N(2)O(6)S(2)·C(3)H(7)NO. The mol­ecule was expected to adopt mirror symmetry but slightly different conformational characteristics of the condensed benzo­thia­zine ring lead to point group symmetry 1. In the crystal, mol­ecules form two types of stacking dimers with distances of 3.464 (2) Å and 3.528 (2) Å between π-systems. As a result, columns extending parallel to [100] are formed, which are connected to inter­mediate di­methyl­formamide solvent mol­ecules by C—H⋯O inter­actions.