1.
IUCrdata
; 8(Pt 1): x221198, 2023 Jan.
Article
in English
| MEDLINE
| ID: mdl-36794049
ABSTRACT
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-methyl-but-2-enyl side chain. The core xanthone moiety is almost planar, with a maximum deviation 0.057â (4)â Å from the mean plane. In the mol-ecule, an intra-molecular O-Hâ¯O hydrogen bond forms an S(6) ring motif. The crystal structure features inter-molecular O-Hâ¯O and C-Hâ¯O inter-actions.