InChI=1/C19H20N2O4/c1-11-4-6-15(12(2)8-11)21-19(23)18(22)20-13(3)14-5-7-16-17(9-14)25-10-24-16/h4-9,13H,10H2,1-3H3,(H,20,22)(H,21,23)/t13-/m1/s1/f/h20-21H FB605F1AD7AAC31B