(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

The asymmetric unit of the title Schiff base compound, C(30)H(38)N(4)O(2), comprises two crystallographically independent mol­ecules, A and B. The structure is non-merohedrally twinned with a refined BASF ratio of 0.219 (6):0.701 (6). Mol­ecule 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 mol­ecule A, and 48.3 (3) and 6.9 (3)° in mol­ecule B. Strong intra­molecular O—H⋯N and N—H⋯O hydrogen bonds generate S(6) ring motifs. The crystal structure is further stabilized by inter­molecular C—H⋯O, C—H⋯π and π–π inter­actions [centroid–centroid distances = 3.870 (4)–3.871 (4) Å].