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Two new guaianolides from Amberboa ramosa
Muhammad Ibrahim1, Rehan Khan, Abdul Malik
1International Centre for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan.
Abstract:
Two new sesquiterpene lactones named amberbins A (1) and B (2), have been isolated from the ethyl acetate soluble fraction of Amberboa ramosa, together with jaseocidine (3), crysoeriol (4) and 3beta,8alpha-dihydroxy-11alpha-methyl-1alphaH,5alphaH,6betaH, 7alphaH,11betaH-guai-10(14), 4(15)-dien-6,12-olide (5). The structures of the isolated compounds have been elucidated on the basis of their spectroscopic data.
