Cheng, Gwendoline Lian Ee and Siow, Hwa Teo and Huey, Chong Kwong and Mohamed Tahir, Mohamed Ibrahim and Silong, Sidik (2010) 12-Acetyl-6-hydroxy-3,3,9,9-tetramethylfuro[3,4-b]pyrano[3,2-h]-xanthene-7,11(3H,9H)-dione. Acta Crystallographica Section E: Structure Reports Online, 66 (12). pp. 3331-3332. ISSN 1600-5368; ESSN:1600-5368
Official URL: http://dx.doi.org/10.1107/S1600536810048592
The title compound, Artonol B, C24H20O7, isolated from the stem bark of Artocarpus kemando, consists of four six-membered rings and one five-membered ring. The tricyclic xanthone ring system is almost planar [maximum deviation 0.115 (5) Å], whereas the pyranoid ring is in a distorted boat conformation·The furan ring is almost coplanar with the fused aromatic ring, making a dihedral angle of 3.76 (9)°. The phenol ring serves as a intramolecular hydrogen-bond donor to the adjacent carbonyl group and also acts as an intermolecular hydrogen-bond acceptor for the methyl groups of adjacent molecules, forming a three-dimensional network in the crystal.
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