New Pyrrolizidine Alkaloids from Ligularia Tsangchanensis.

New Pyrrolizidine Alkaloids from Ligularia Tsangchanensis. New Pyrrolizidine Alkaloids from Ligularia tsangchanensis New Pyrrolizidine Alkaloids from Ligularia tsangchanensis A Novel Pyrrolizidine Alkaloid from Ligularia lankongensis Studies on constituents of crude drugs. XV. New pyrrolizidine alkaloids from Ligularia dentata. Studies on constituents of crude drugs. XV. New pyrrolizidine alkaloids from Ligularia dentata. A new pyrrolizidine alkaloid and other constituents from the roots of Ligularia achyrotricha (Diels) Ling Pyrrolizidine Alkaloids from Ligularia sibirica Cass. and Tephroseris integrifolia L. Two New Nortriterpenes from Ligularia tongolensis. Pyrrolizidine Alkaloids and Bisabolane Sesquiterpenes from the Roots of Ligularia cymbulifera