InChI=1S/C21H29N3O3/c1-13(2)18(24(5)21(27)19(25)14(3)4)20(26)22-11-10-15-12-23-17-9-7-6-8-16(15)17/h6-9,12-14,18,23H,10-11H2,1-5H3,(H,22,26)/t18-/m0/s1