InChI=1S/C19H20N2O3/c1-10(22)7-15(23)21-18(24)17-12-9-20-14-6-4-5-11(16(12)14)8-13(17)19(21,2)3/h4-6,9,13,17,20H,7-8H2,1-3H3/t13-,17+/m1/s1