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The title mol-ecule crystallizes as a di-methyl-formamide monosolvate, C 19 H 14 N 2 O 6 S 2 ·C 3 H 7 NO. The mol-ecule was expected to adopt mirror symmetry but slightly different conformational characteristics of the condensed benzo-thia-zine ring lead to point group symmetry 1. In the crystal, mol-ecules 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 inter-mediate di-methyl-formamide solvent mol-ecules by C-H⋯O inter-actions.

acta crystallographica. section e, crystallographic communications

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