InChI=1S/C9H12N2O9S/c12-5-4(2-19-21(16,17)18)20-7(6(5)13)3-1-10-9(15)11-8(3)14/h1,4-7,12-13H,2H2,(H,16,17,18)(H2,10,11,14,15)