Mol­ecular and crystal structure of gossypol tetra­methyl ether with an unknown solvate

The title compound, C(34)H(38)O(8) (systematic name: 5,5′-diisopropyl-2,2′,3,3′-tetra­meth­oxy-7,7′-dimethyl-2H,2′H-8,8′-bi­[naphtho­[1,8-bc]furan]-4,4′-diol), has been obtained from a gossypol solution in a mixture of dimethyl sulfate and methanol. The mol­ecule is situated on a twofold rotation axis, so the asymmetric unit contains one half-mol­ecule. In the mol­ecule, the hy­droxy groups are involved in intra­molecular O—H⋯O hydrogen bonds, and the two naphthyl fragments are inclined each to other by 83.8 (1)°. In the crystal, weak C—H⋯O and C—H⋯π inter­actions consolidate the packing, which exhibits channels with an approximate diameter of 6 Å extending along the c-axis direction. These channels are filled with highly disordered solvent mol­ecules, so their estimated scattering contribution was subtracted from the observed diffraction data using the SQUEEZE option in PLATON [Spek, A. L. (2015). Acta Cryst. C71, 9–18].