Sesquiterpene Lactones inTanacetum macrophillum

Abstract
The known sesquiterpene lactones canin, 1, artecanin, 2, hydroxyachillin, 3, hanfillin, 4, and the new ones macrotanacin, 5, and tanaphillin, 6, were isolated from Tanacetum macrophillum L.; of them, compounds 1, 2, 3 and 5 - from the leaves, and 2, 4 and 6 - from the flowers. The lactone 6 is one of the first known 1,10-seco-guaianolides.

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