A Novel Pyrrolizidine Alkaloid from Ligularia lankongensis

A Novel Pyrrolizidine Alkaloid from Ligularia lankongensis New Pyrrolizidine Alkaloids from Ligularia tsangchanensis New Pyrrolizidine Alkaloids from Ligularia tsangchanensis 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 Studies on constituents of crude drugs. XV. New pyrrolizidine alkaloids from Ligularia dentata. New Pyrrolizidine Alkaloids from Ligularia Tsangchanensis. Pyrrolizidine Alkaloids and Bisabolane Sesquiterpenes from the Roots of Ligularia cymbulifera Pyrrolizidine Alkaloids from Ligularia sibirica Cass. and Tephroseris integrifolia L. Pyrrolizidine Alkaloids and Bisabolane Sesquiterpenes from the Roots of <i>Ligularia cymbulifera</i>