InChI=1S/C21H22N2O3/c1-26-18(25)23-15-6-3-2-5-14(15)21-10-12-22-11-4-7-19(17(21)22)8-9-20(21,23)13-16(19)24/h2-7,17H,8-13H2,1H3/t17-,19+,20+,21+/m0/s1