Abstract
The title compound, C23H20N2O4, is a soluble precursor (`latent pigment') of diketopyrrolopyrrole pigments. The tert-butoxycarbonyl group is twisted by 78.5 (1)° with respect to the heterocyclic ring system. In the crystal structure, pairs of molecules form centrosymmetric dimers through N—H⋯O intermolecular hydrogen bonds and are stacked in a herring-bone fashion along the a axis.
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