Abstract
3,4',5-Trihydroxy-3',7-dimethoxyflavanone was isolated from the ligroin extract of the leaves of Blumea balsamifera, while the acetone extract yielded 3,4',5-trihydroxy-7-methoxyflavanone and a new biflavonoid identifed as 3-O-7"-biluteolin (1). The isolation of 1 is significant since a biflavonoid with a C-O-C linkage of the type [I-3-O-II-7] has not been previously reported from a plant. (C) 2004 Elsevier B.V. All rights reserved.