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The asymmetric unit of the title Schiff base compound, C(30)H(38)N(4)O(2), comprises two crystallographically independent mol-ecules, A and B. The structure is non-merohedrally twinned with a refined BASF ratio of 0.219 (6):0.701 (6). Mol-ecule B shows both phenol-imine and keto-amine tautomeric forms in a single structure. The dihedral angles between the central ring and the two outer rings are 5.9 (3) and 48.4 (3)° in mol-ecule A, and 48.3 (3) and 6.9 (3)° in mol-ecule B. Strong intra-molecular O-H⋯N and N-H⋯O hydrogen bonds generate S(6) ring motifs. The crystal structure is further stabilized by inter-molecular C-H⋯O, C-H⋯π and π-π inter-actions [centroid-centroid distances = 3.870 (4)-3.871 (4) Å].

acta crystallographica. section e

(Z)-3-Diethylamino-6-({2-[(E)-4-(diethylamino)-2-hydroxybenzylideneamino]-4,5-dimethylphenyl}aminomethylidene)cyclohexa-2,4-dienone–5,5′-bis(diethylamino)-2,2′-[4,5-dimethyl-o-phenylenebis(nitrilomethylidyne)]diphenol