3,6-Di-2-pyridyl­pyrrolo­[3,4-c]­pyrrole-1,4(2H,5H)-dione

The title compound, C₁₆H₁₀N₄O₂, is an organic red pigment utilized for H₂ gas sensors. The asymmetric unit contains two half-molecules, each molecule being centrosymmetric. The two independent centrosymmetric diketopyrrolo­pyrrole moieties are connected by N—H...N hydrogen bonds to form a ribbon structure along [100]. The mol­ecules are stacked in a `hunter's fence' fashion (viz. when viewed from the side, molecles, slipped by about 70° within moleclar stacks, cross each other in a fence-like structure) along the b axis.