InChI=1/C20H16N2O4S/c1-2-14-8-3-5-11-16(14)21-19(23)18(27-20(21)24)13-7-10-15-9-4-6-12-17(15)22(25)26/h3-13H,2H2,1H3/b10-7+,18-13-	A7E2676F3D4A6D21