Pyrrolizidine alkaloids from Echium glomeratum (Boraginaceae).
Alali FQ, Tahboub YR, Ibrahim ES, Qandil AM, Tawaha K, Burgess JP, Sy A, Nakanishi Y, Kroll DJ, Oberlies NH. Pyrrolizidine alkaloids from Echium glomeratum (Boraginaceae). Phytochemistry. 2008 Sep; 69(12):2341-6.