Crystal structure of racemic (R/S,E)-2-(4-hy­droxy­phen­yl)-4-(2-phenyl­hydrazin-1-yl­idene)chromane-5,7-diol ethanol monosolvate

The crystal structure of racemic (R/S,E)-2-(4-hy­droxy­phen­yl)-4-(2-phenyl­hydrazin-1-yl­idene)chromane-5,7-diol ethanol monosolvate, C(21)H(18)N(2)O(4)·C(2)H(6)O, in a centrosymmetric lattice is reported. The two racemates occupy the same position in the asymmetric unit – a disordered mixed enanti­omeric structure. Hydrogen bonds of the type O—H⋯C(π) in addition to typical C—H⋯O, O—H⋯O and O—H⋯N are identified. A positional disorder is seen in the solvent mol­ecule (ethanol) as well. The phenyl­hydrazone group is nearly coplanar with the chromane ring system [dihedral angle = 15.5 (1)°], while the the 4-hy­droxy­phenyl ring is perpendicular [dihedral angle = 87.2 (1)°] to the chromane. The pyran ring has an envelope pucker [Q = 0.363 (3) Å, θ = 57.6 (3)°; and for the enanti­omer: Q = 0.364 (3) Å, θ = 127.4 (4)°].