Culvenor C C, Clarke M, Edgar J A, Frahn J L, Jago M V, Peterson J E, Smith L W
Experientia. 1980 Apr 15;36(4):377-9. doi: 10.1007/BF01975096.
Eight pyrrolizidine alkaloids of hepatotoxic type have been indentified in leaves of Symphytum X uplandicum. The combined alkaloids exhibit chronic hepatotoxicity in rats.