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The asymmetric unit of the 1:19 title co-crystal of 2-amino-4-(3,4-dimeth­oxy­phen­yl)-5,6-dihydro­benzo[ h ]quinoline-3-carbo­nitrile and 3-amino-1-(3,4-dimeth­oxy­phen­yl)-9,10-dihydro­phenanthrene-2,4-dicarbonitrile, 0.05C 22 H 19 N 3 O 2 ·0.95C 24 H 19 N 3 O 2 , has the atoms of the fused-ring system and those of the amino, cyano and dimeth­oxy­phenyl substitutents overlapped. The fused-ring system is buckled owing to the ethyl­ene linkage in the central ring with the two flanking aromatic rings being twisted by 31.9 (1)°. The ring of the dimeth­oxy­phenyl substituent is twisted by 72.4 (1)° relative to the amino- and cyano-bearing aromatic ring. In the crystal, mol­ecules are linked by duplex amine N—H⋯O(meth­oxy) hydrogen bonds in a cyclic association [graph-set  R22 (7)], generating a helical chain structure extending along [201].

acta crystallographica. section e

2-Amino-4-(3,4-dimethoxyphenyl)-5,6-dihydrobenzo[<i>h</i>]quinoline-3-carbonitrile–3-amino-1-(3,4-dimethoxyphenyl)-9,10-dihydrophenanthrene-2,4-dicarbonitrile (1/19)

2-Amino-4-(3,4-dimethoxyphenyl)-5,6-dihydrobenzo[h]quinoline-3-carbonitrile–3-amino-1-(3,4-dimethoxyphenyl)-9,10-dihydrophenanthrene-2,4-dicarbonitrile (1/19)