Alkaloids and triterpenoids of Symphytum officinale

Alkaloids and triterpenoids of Symphytum officinale Studies on Constituents of Crude Drugs. I. Alkaloids of Symphytum officinale LINN. Symviridine, a new pyrrolizidine alkaloid from Symphytum species Isolation of Symlandine from the Roots of Common Comfrey (<i>Symphytum officinale</i>) Using Countercurrent Chromatography The alkaloids of Symphytum × uplandicum (Russian comfrey) Alkaloids and other compounds of Symphytum tuberosum Thesinine-4′-O-β-d-glucoside the first glycosylated plant pyrrolizidine alkaloid from Borago officinalis Pyrrolizidine alkaloids from Lithospermum officinale Pyrrolizidine and tetrahydroisoquinoline alkaloids from Echium humile Pyrrolizidine alkaloids fromCynoglossum furcatum