2,3-Dehydrokievitone 4H-1-Benzopyran-4-one, 5,7-dihydroxy-3-(2,4-dihydroxyphenyl)-8-(3-methyl-2-butenyl)- 5,7-Dihydroxy-3-(2,4-dihydroxyphenyl)-8-(3-methyl-2-butenyl)-4H-1-benzopyran-4-one 74161-25-4 BRN 4333751