3,4,5-Trihydr­oxy-N′-(1H-indol-2-ylmethyl­idene)benzohydrazide–1H-indole-2-carbaldehyde azine–methanol (2/1/2)

The title compound, 2C(16)H(13)N(3)O(4)·C(18)H(14)N(4)·2CH(4)O, was crystallized from the reaction between 3,4,5-trihydroxy­benzoyl­hydrazine and indole-2-carbaldehyde in a mixture of ethanol and methanol. The compound is a stoichiometric 2:1 cocrystal of the methanol-solvated reaction product, 3,4,5-trihydr­oxy-N′-(1H-indol-2-ylmethyl­idene)benzohydrazide and 1H-indole-2-carbaldehyde azine that arose unexpectedly during the synthesis. The former mol­ecules are linked by O—H⋯O hydrogen bonds and also by π–π stacking inter­actions between benzoyl­hydrazide rings into a two-dimensional network. The methanol solvent mol­ecules are hydrogen bonded to this network. The centrosymmetric azine mol­ecules are not engaged in hydrogen bonding.