From an aqueous extract of Helianthus annuus L. cvs. SH-222 and VYP leaves, six new heliannuols have been isolated: three 7,10-heliannanes, heliannuols F (1), I (4), and J (5) and three 7,11-heliannanes, heliannuols G (2), H (3), and K (6). Their structure elucidation was based on extensive spectral studies. The phytotoxicity exhibited by compounds 1−4 and 6 suggests that these new bioactive sesquiterpenes may be involved in plant defense against dicotyledons.
No takes yet. Share an insight, caveat, or question.
Macı́as et al. (1999) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: