Five norisoprenoids were isolated from the green marine alga Ulva lactuca. Two new compounds were assigned to (3R,5R,6R,7E)3,5,6-trihydroxy-7-megastigmen-9-one (1) and (3S,5R,6S,7E)3,5,6-trihydroxy-7-megastigmen-9-one (2). The structures and absolute configurations of the five compounds were determined by analyses of NMR, MS and circular dichroism (CD).
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Document Type: Research Article
School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
Department of Instrumental Analysis, Shenyang Pharmaceutical University, Shenyang, China
January 1, 2007