By condensation of 1,4,5,8-tetrahydroxyanthraquinone (I) with ethylenediamine (II) in hot tetramethylethylenediamine.
By condensation of 2,3-dihydro-1,4-dihydroxyanthraquinone (I) with N-(aminoethyl)ethanolamine (II) in refluxing ethanol, followed by oxidation with air and treatment with acetic acid.