A new pyranoxanthone from the stems of Calophyllum membranaceum

Guang Ying Chen, Guo Yuan Zhu, Chang Ri Han*, Jun Zhao, Xiao Ping Song, David W F FONG

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

10 Citations (Scopus)


A new pyranoxanthone, membraxanthone A (1) has been isolated from the ethanol extract of the stem of Calophyllum membranaceum, together with three known pyranoxanthones, nigrolineaxanthone W (2), calophinone (3) and caloxanthone I (4), and three known triterpenoids, friedelin (5), canophyllol (6) and canophyllic acid (7). Their structures were elucidated on the basis of chemical evidence and intensive spectroscopic analysis including HRESI-MS, 1D- and 2D-NMR. All of the compounds were isolated from this plant for the first time. These xanthones showed no activities towards human cancer cell lines KB, BC-1 and NCI-4460.

Original languageEnglish
Pages (from-to)249-254
Number of pages6
Issue number13
Publication statusPublished - 17 Jul 2008

Scopus Subject Areas

  • Organic Chemistry

User-Defined Keywords

  • Calophyllum membranaceum
  • Guttiferae
  • Membraxanthone A
  • Pyranoxanthones
  • Triterpenoids


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