2,6-epoxy-2H-anthra[2,3-b]oxocin-8,13-dione, 3,4,5,6-tetrahydro-7,9,11-trihydroxy-2-methyl- 7,9,11-trihydroxy-2-methyl-3,4,5,6-tetrahydro-2H-2,6-epoxyanthra[2,3-b]oxocine-8,13-dione InChI=1/C20H16O7/c1-20-4-2-3-12(26-20)16-13(27-20)7-10-15(19(16)25)18(24)14-9(17(10)23)5-8(21)6-11(14)22/h5-7,12,21-22,25H,2-4H2,1H