Pyrrolizidine alkaloid level in Senecio bicolor (Wilid.) Tod, ssp. cineraria (DC.) from middle Europe.

From Senecio bicolor, ssp. cineraria, cultivated in middle Europe, seven pyrrolizidine alkaloids (PA) were isolated and their structures elucidated by spectroscopical methods. Besides the already known senecionine, integerrimine, seneciphylline, jacobine, jacoline and jaconine the jacobine-acetate was found. On account of structure toxicity relationship all PA show toxic side-effects.