InChI=1S/C20H17ClN2O3/c21-12-6-7-14-16(11-18(20(25)26)22-17(14)10-12)15-8-9-23(19(15)24)13-4-2-1-3-5-13/h1-7,10,18,22H,8-9,11H2,(H,25,26)/b16-15+/t18-/m1/s1