Complete (1)H and (13)C NMR signal assignments of two lactucin-type sesquiterpene lactone glycosides, derivatives of 11β,13-dihydrolactucin, isolated from roots of Picris conyzoides, were achieved by one- and two-dimensional NMR experiments, allowing the correction of previously published data for
From Picris kamtschatica two new guaianolide glycosides, including a beta-allopyranosyl analogue of ixerin F, were isolated, in addition to ten known sesquiterpene lactones and six phenolic compounds. This is the first time a sesquiterpene lactone alloside has been described from plants. The
A new monoterpenoid glycoside, named (-)-cis-chrysanthenol-beta-D-galactopyranoside (1), was isolated from the air-dried parts of Picris echoides along with the known compounds (-)-cis-chrysanthenol and 1alpha-hydroxyeudesma-2,4(15),11(13)-trien-5alpha,7alphaH-12-oic acid.
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