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 3β,8α-dihydroxy-11α-memyl-1αH,5αH,6βH, 7αH,11βH-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.
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