InChI=1S/C12H12N2O7S/c1-2-12(9(15)13-11(17)14-10(12)16)7-3-5-8(6-4-7)21-22(18,19)20/h3-6H,2H2,1H3,(H,18,19,20)(H2,13,14,15,16,17)