InChI=1S/C21H26N2O3/c1-3-11-12-8-15-18-21(13-6-4-5-7-14(13)22-18)9-16(23(15)20(11)25)17(12)19(21)26-10(2)24/h4-7,11-12,15-20,22,25H,3,8-9H2,1-2H3