InChI=1S/C19H18N2O7S/c1-27-16-6-2-14(3-7-16)10-18(20-12-22)19(21-13-23)11-15-4-8-17(9-5-15)28-29(24,25)26/h2-13H,1H3,(H,20,22)(H,21,23)(H,24,25,26)