Symviridine, a new pyrrolizidine alkaloid from Symphytum species

Symviridine, a new pyrrolizidine alkaloid from Symphytum species Studies on Constituents of Crude Drugs. I. Alkaloids of Symphytum officinale LINN. Isolation of Symlandine from the Roots of Common Comfrey (<i>Symphytum officinale</i>) Using Countercurrent Chromatography Alkaloids and triterpenoids of Symphytum officinale The alkaloids of Symphytum × uplandicum (Russian comfrey) Structure and toxicity of the alkaloids of Russian comfrey (Symphytum x uplandicum Nyman), a medicinal herb and item of human diet Pyrrolizidine alkaloids from Lithospermum officinale Pyrrolizidine alkaloids fromCynoglossum furcatum A Novel Pyrrolizidine Alkaloid from Ligularia lankongensis Uspallatine, a pyrrolizidine alkaloid from senecio uspallatensis