1,5-Dihydroxy-3-methoxy-4-(3-hydroxy-3-methylbutyl)xanthone 1,5-dihydroxy-4-(3-hydroxy-3-methylbutyl)-3-methoxy-9H-xanthen-9-one 1,8-Dihydroxy-4-(3-hydroxy-3-methyl-butyl)-3-methoxy-xanthen-9-one 9H-xanthen-9-one, 1,5-dihydroxy-4-(3-hydroxy-3-methylbutyl)-3-methoxy- InChI=1/C19H20O6/c1-19(2,23)8-7-10-14(24-3)9-13(21)15-16(22)11-5-4-6-12(20)17(11)25-18(10)15/h4-6,9,20-21,23H,7-8H2,1-3H Nigrolineaxanthone A