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|Section2= |Section3= }} Valoneic acid dilactone is a hydrolysable tannin that can be isolated from the heartwood of ''Shorea laeviforia''〔5A-Reductase inhibitory tannin-related compounds isolated from Shorea laeviforia. Yoshio Hirano, Ryuichiro Kondo and Kokki Sakai, Journal of wood science, Volume 49, Number 4, pp.339-343,〕 and in oaks species like the North American white oak (''Quercus alba'') and European red oak (''Quercus robur'').〔Analysis of oak tannins by liquid chromatography-electrospray ionisation mass spectrometry. Pirjo Mämmelä, Heikki Savolainenb, Lasse Lindroosa, Juhani Kangasd and Terttu Vartiainen, Journal of Chromatography A, Volume 891, Issue 1, 1 September 2000, Pages 75-83, 〕 It shows an inhibitory effect on 5-alpha reductase,〔 an enzyme involved in steroids metabolism and prostate cancer. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「valoneic acid dilactone」の詳細全文を読む スポンサード リンク
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