The alkaloids of Symphytum × uplandicum (Russian comfrey)

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 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 Alkaloids and triterpenoids of Symphytum officinale Analysis of herbal teas made from the leaves of comfrey (Symphytum officinale): reduction of N-oxides results in order of magnitude increases in the measurable concentration of pyrrolizidine alkaloids Alkaloids and other compounds of Symphytum tuberosum Pyrrolizidine alkaloids from Onosma arenaria (Boraginaceae) Analysis, separation, and bioassay of pyrrolizidine alkaloids from comfrey (<i>symphytum officinale</i>)