This amorphous pyrrolizidine alkaloid has been isolated from Arnsinckia hispida
(Ruiz et Pav.) Johnst., A. interrnedia Fisch & Mey, and A. lycopsoides Lehm. It
is dextrorotatory having [α]20D + 3.1 ° (c 5.98, EtOH). Alkaline hydrolysis yields
retronecine and viridifloric acid.
