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6,6'-Dimethoxygossypolone (systematic name: 7,7'-dihydroxy-5,5'-diisopropyl-6,6'-dimethoxy-3,3'-dimethyl-1,1',4,4'-tetraoxo-2,2'-binaphthalene-8,8'-dicarbaldehyde), C32H30O10, is a dimeric molecule formed by oxidation of 6,6'-dimethoxygossypol. When crystallized from acetone, 6,6'-dimethoxygossypolone has monoclinic (P21/c) symmetry, and there are two molecules within the asymmetric unit. Of the four independent quinoid rings, three display flattened boat conformations and one displays a flattened chair/half-chair conformation. The angles between the planes of the two bridged naphthoquinone structures are fairly acute, with values of about 68 and 69°. The structure has several intramolecular O-H...O and C-H...O hydrogen bonds and several weak intermolecular C-H...O hydrogen bonds, but no intermolecular O-H...O hydrogen bonds.
Zelaya, Carlos A.
Stevens, Edwin D.
Dowd, Michael K.
Acta crystallographica. Section C, Crystal structure communications 2010 Oct., v. 66 no. 10
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