title: 12-Acetyl-6-hy-droxy-3,3,9,9-tetra-methyl-furo[3,4-b]pyrano[3,2-h]xanthene-7,11(3H,9H)-dione.
abstract: The title compound, Artonol B, C(24)H(20)O(7), 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 pyran-oid 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 intra-molecular hydrogen-bond donor to the adjacent carbonyl group and also acts as an inter-molecular hydrogen-bond acceptor for the methyl groups of adjacent mol-ecules, forming a three-dimensional network in the crystal.
authors: Department of Chemistry, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors: Gwendoline Cheng Lian
authors: GC
authors: Ee
authors: Siow Hwa
authors: SH
authors: Teo
authors: Huey Chong
authors: HC
authors: Kwong
authors: Mohamed Ibrahim
authors: MI
authors: Mohamed Tahir
authors: Sidik
authors: S
authors: Silong
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