Two New Nortriterpenes from Ligularia tongolensis.

Two New Nortriterpenes from Ligularia tongolensis. New Pyrrolizidine Alkaloids from Ligularia Tsangchanensis. A Novel Pyrrolizidine Alkaloid from Ligularia lankongensis New Eremophilenolides from<i> Ligulariopsis shichuana</i> Pyrrolizidine Alkaloids from Ligularia sibirica Cass. and Tephroseris integrifolia L. Bisabolane Sesquiterpenes from the Roots of <i>Ligularia </i><i>c</i><i>ymbulifera</i> Antiproliferative Sesquiterpenoids from <i>Ligularia rumicifolia</i> with Diverse Skeletons Pyrrolizidine Alkaloids and Bisabolane Sesquiterpenes from the Roots of Ligularia cymbulifera Studies on constituents of crude drugs. XV. New pyrrolizidine alkaloids from Ligularia dentata. Sesquiterpenes from Rzedowskia tolantonguensis