Molecular and crystal structure of 5,9-dimethyl-5<i>H</i>-pyrano[3,2-<i>c</i>:5,6-<i>c</i>′]bis[2,1-benzothiazin]-7(9<i>H</i>)-one 6,6,8,8-tetroxide dimethylformamide monosolvate
Acta crystallographica. Section E, Crystallographic communications