Diospyrin.
The structure of the title natural product, 1',5-dihydroxy-3',7-dimethyl-2,2'-binaphthalene-1,4,5',8'-tetrone, C(22)H(14)O(6), confirms the atomic connectivity postulated on the basis of spectroscopic data. The geometric parameters are normal and the angle between the planes of the two ring systems is 59.74 (2) degrees. The crystal packing is influenced by O-H.O hydrogen bonds, and possible short C-H.O and pi-pi stacking interactions.
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