Four New Chalcones from Erythrina abyssinica - Cui, Long; Thuong, Phuong Thien; Lee, Hyun Sun; Njamen, Dieudonné; Mbafor, Joseph Tanyi; Fomum, Z Tanee; Lee, Junwon; Kim, Young Ho; Oh, Won Keun (Planta Medica, 2008)