Artelastocarpin and carpelastofuran, two new flavones, and cytotoxicities of prenylflavonoids from Artocarpus elasticus against three cancer cell lines - Cidade,H.M.; Nascimento,M.SJ.; Pinto,M.MM.; Kijjoa,A.; Silva,A.MS.; Herz,W. (Planta Med, 2001)