1Liu K,Roeder E. Pyrrolizidine alkaloids from Senecio argunesis[J]. Phytochemistry, 19.91,30(4) :1303- 1305.
2Resch J F,Meinwald J. A revised structure for acetylheliosupine[J]. Phytochemistry, 1982,21(9) :2430-2431.
3Roeder E. Carbon-13 NMR spectroscopy of pyrrollzidine alkaloids[J]. Phytochemistry, 1990,29(1 ) : 11-29.
4Liu K,Roeder E,Chen H L,et al. Pyrrolizidine from Eupatorium fortunei[J]. Phytochemistry, 1992,31(7) :2573-2574.
5Roeder E,Wiedenfeld H,Schraut R. Pyrrolizidine alkaloids from Alkanna tinctoria[J]. Phytochemistry,1984,23(9):2125-2126.
6Kim N C,Oberlies N H,Brine D R,et al. Isolation of symlandine from the roots of common comfrey (Symphytum officqnale) using countereurrent chromatography[J]. Journal of Natural Products, 2001.64 : 251-253.
7Kelley H A, Robins D J. Pyrrolizidine alkaloids from Lindelofia longiflora [J]. Fitoterapia, 1990,61 ( 1 ) : 89-90.
8Cheeke P R. Toxicity and metabolism of pyrrolizidine alkaloids[J]. Journal of Animal Science, 1988,66 : 2343-2350.
9付坤俊.黄土高原植物志[M].北京:科技文献出版社,1987,5(7).350-354.
10Buckmaster G W.Pyrrolizidine alkaloid poisoning in rats:protective effects of dietary cysteine[J].J Ani Sci,1976,3(2):464~473.