InChI=1/C21H16N2O4S/c24-20-14-28-21(15-5-4-6-17(13-15)23(25)26)22(20)16-9-11-19(12-10-16)27-18-7-2-1-3-8-18/h1-13,21H,14H2/t21-/m1/s1 4EE93D22441893C1