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|Section2= |Section3= }} The flavans are benzopyran derivatives that use the 2-phenyl-3,4-dihydro-2H-chromene skeleton. They may be found in plants. These compounds include the flavan-3-ols, flavan-4-ols and flavan-3,4-diols (leucoanthocyanidin). A C-glycosidic flavan can be isolated from cocoa liquor.〔Proanthocyanidin glycosides and related polyphenols from cacao liquor and their antioxidant effects. Tsutomu Hatano, Haruka Miyatake, Midori Natsume, Naomi Osakabe, Toshio Takizawa, Hideyuki Ito and Takashi Yoshida, Phytochemistry, April 2002, Volume 59, Issue 7, Pages 749–758, 〕 ''Casuarina glauca'' is an actinorhizal plant producing root nitrogen-fixing nodules infested by ''Frankia''. There is a regular pattern of cell layers containing flavans. == 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「flavan」の詳細全文を読む スポンサード リンク
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