Abstract: | In the title complex, pyromellitic acid–dimethyl sulfoxide (1/2), C10H6O8·2C2H6OS, molecules of pyromellitic acid (1,2,4,5‐benzenetetracarboxylic acid) and dimethyl sulfoxide, the latter being well ordered, are linked to each other by O—H⃛O hydrogen bonds. The formula unit displays crystallographic inversion symmetry. The packing consists of ribbons of hydrogen‐bonded rings that can be described by graph set C(10)R(18). |