1,3,5-trihydroxy-2-(3-methylbut-2-enyl)-4-(1,1-dimethylprop-2-enyl) xanthone 4-(1,1-Dimethyl-allyl)-1,3,5-trihydroxy-2-(3-methyl-but-2-enyl)-xanthen-9-one 4-(1,1-dimethylprop-2-en-1-yl)-1,3,5-trihydroxy-2-(3-methylbut-2-en-1-yl)-9H-xanthen-9-one 9H-xanthen-9-one, 4-(1,1-dimethyl-2-propenyl)-1,3,5-trihydroxy-2-(3-methyl-2-butenyl)- Allanxanthone A InChI=1/C23H24O5/c1-6-23(4,5)17-20(27)13(11-10-12(2)3)18(25)16-19(26)14-8-7-9-15(24)21(14)28-22(16)17/h6-10,24-25,27H,1,11H2,2-5H