title: Urceolatol, a tetracyclic bromobenzaldehyde dimer from Polysiphonia urceolata.
abstract: Urceolatol (1), a novel bromobenzaldehyde dimer, together with one known bromophenol, 3-bromo-4,5-dihydroxy-benzaldehyde (2), were isolated from the red alga Polysiphonia urceolata. The structure and absolute stereochemistry of 1 were elucidated to be (5R,10R)-2,7-dibromo-3,8-dihydroxy-5,10-dimethoxyl-5,10-dihydrochromeno[5,4,3-cde]chromene, on the basis of spectroscopic techniques and X-ray diffraction analysis.
authors.affiliation: Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China.
authors.forename: Q-W
authors.initials: QW
authors.lastname: Liu
authors.forename: C-H
authors.initials: CH
authors.lastname: Tan
authors.forename: T
authors.initials: T
authors.lastname: Zhang
authors.forename: S-J
authors.initials: SJ
authors.lastname: Zhang
authors.forename: L-J
authors.initials: LJ
authors.lastname: Han
authors.forename: X
authors.initials: X
authors.lastname: Fan
authors.forename: D-Y
authors.initials: DY
authors.lastname: Zhu
mesh_terms: D001547:Benzaldehydes / Q000737:chemistry* / Q000302:isolation & purification; D019281:Dimerization; D006576:Heterocyclic Compounds, 4 or More Rings / Q000737:chemistry* / Q000302:isolation & purification; D008958:Models, Molecular; D015394:Molecular Structure; D000461:Rhodophyta / Q000737:chemistry*
chemical_list: D001547:Benzaldehydes; D006576:Heterocyclic Compounds, 4 or More Rings; C517456:urceolatol