1,5,7-trihydroxy-4-methoxy-2-(3-methylbut-2-en-1-yl)-9H-xanthen-9-one 2,4,8-Trihydroxy-5-methoxy-7-(3-methyl-but-2-enyl)-xanthen-9-one 9H-xanthen-9-one, 1,5,7-trihydroxy-4-methoxy-2-(3-methyl-2-butenyl)- InChI=1/C19H18O6/c1-9(2)4-5-10-6-14(24-3)19-15(16(10)22)17(23)12-7-11(20)8-13(21)18(12)25-19/h4,6-8,20-22H,5H2,1-3H Umbilicaxanthone