5,8-Dihy­droxy-2,2-dimethyl-12-(3-methyl­but-2-en­yl)pyrano[3,2-b]xanthen-6-one (brasixanthone B)

• Published in: IUCrData
• Main Author: Binti Seruji N.M.U.; Rosli M.M.; Jong V.Y.M.; Karunakaran T.; Lizazman M.A.; Marlina A.; Binti Halid Y.Y.
• Format: Article
• Language: English
• Published: International Union of Crystallography 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85149421542&doi=10.1107%2fS2414314622011981&partnerID=40&md5=c28f4b3e5b880350a01e872b1ee5e366
• ISSN: 24143146
• DOI: 10.1107/S2414314622011981

The title compound (trivial name brasixanthone B), C23H22O5, isolated from Calophyllum gracilentum, is characterized by a xanthone skeleton of three fused six-membered rings plus an additional fused pyrano ring and one 3-methyl­but-2-enyl side chain. The core xanthone moiety is almost planar, with a maximum deviation 0.057 (4) Å from the mean plane. In the mol­ecule, an intra­molecular O-H⋯O hydrogen bond forms an S(6) ring motif. The crystal structure features inter­molecular O-H⋯O and C-H⋯O inter­actions. © 2023 IUCr. All rights reserved.