InChI=1S/C12H16N2O7S/c13-10(12(16)17)5-6-11(15)14-7-8-1-3-9(4-2-8)21-22(18,19)20/h1-4,10H,5-7,13H2,(H,14,15)(H,16,17)(H,18,19,20)