6,11-dihydroxy-4-methyl-1,2-dihydroanthra[2,1-b]thiophene-7,10-dione 3,3-dioxide InChI=1/C17H12O6S/c1-7-6-9-12(8-4-5-24(22,23)17(7)8)16(21)14-11(19)3-2-10(18)13(14)15(9)20/h2-3,6,20-21H,4-5H2,1H anthra[2,1-b]thiophene-7,10-dione, 1,2-dihydro-6,11-dihydroxy-4-methyl-, 3,3-dioxide