Irilone is an isoflavone, a type of flavonoid. It can be found in Trifolium pratense (red clover), in Iris unguicularisNew and Known Constituents from Iris unguicularis and Their Antioxidant Activity. Atta-ur-Rahman, Sumaira Hareem, M. Iqbal Choudhary, Bilge Sener, Ahmed Abbaskhan, Hina Siddiqui, Shazia Anjum, Ilkay Orhan, Ilhan Gurbuz and Filiz Ayanoglu, HeteroCycles, 2010, Special issue, Vol 82, No. 1, pages 813–824, and in Iris germanica.Lipase-catalyzed regioselective protection/deprotection of hydroxyl groups of the isoflavone irilone isolated from Iris germanica. Nighat Nazir, Surrinder Koul, Mushtaq Ahmad Qurishi, Subhash Chandra Taneja and Ghulam Nabi Qazi, Biocatalysis and Biotransformation, 2 December 2008, 1029–2446, Volume 27, Issue 2, Pages 118–123,

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