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Abstract
Six cycloartane triterpenes have been isolated from the red alga Galaxaura sp. The new structures (galaxaurols A–E) were determined to be methyl 3β-hydroxy-23-oxocycloart-24-en-29-oate (2), methyl 23(E)-3β-hydroxy-25-methoxycycloart-23-en-29-oate (3), methyl 23(E)-3β-hydroxycycloarta-23,25-dien-29-oate (4), 23(E)-25-methoxycycloart-23-en-3β,29-diol (5), and cycloart-24-en-3β,23α,29-triol (6), respectively.
Acknowledgements
This work was partially supported by a grant from the Research Grant Council of Hong Kong (to C.-T. Che). We are grateful to Professor Liu Xijin for taxonomic identification of the algal specimen. Data presented in this paper were taken from the PhD thesis of W.-H. Zhang (Hong Kong University of Science and Technology, 2000).