Abstract
Abstract The structure of alnustone (1) isolated from the male flower of Alnus pendula Matsum. has been established to be 1,7-diphenyl-1,3-heptadien-5-one. Previously-known compounds, β-phenylethyl cinnamate (6), cinnamaldehyde, benzylacetone, β-phenylethyl alcohol, pinocembrin (7), pinostrobin (8), alpinetin (9), galangin (11), pinosylvin (13), and its monomethyl ether (14), eugenol, chavicol, cinnamic acid, β-phenylpropionic acid, and benzoic acid, were identified along with the above new ketone.
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