1H,3H-2-benzopyrano[6,5,4-mna]xanthen-1-one, 3,5-dihydroxy- 3,5-Dihydroxy-3H-2,6-dioxa-benzo[def]chrysen-1-one 3,5-dihydroxy-1H,3H-isochromeno[6,5,4-mna]xanthen-1-one InChI=1/C18H10O5/c19-12-7-11-14-10(17(20)23-18(11)21)6-5-9-8-3-1-2-4-13(8)22-16(12)15(9)14/h1-7,18-19,21