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Dehydrogenation of a 5,6-dihydro-acridine with palladium on carbon led to partial dehydrochlorination and formation of a mixture of two indolacridines C26H17ClN2 and C26H18N2 which are only distinguished by substitution of a chlorine by hydrogen atom. They co-crystallize from ethanol as a solid solution of the two compounds with ratios between 90:10 and 42:58 by whole molecule disorder in a triclinic...