InChI=1S/C19H26N4O3/c1-14(2)10-17(18(24)21-16-8-9-23(11-16)13-20)22-19(25)26-12-15-6-4-3-5-7-15/h3-7,14,16-17H,8-12H2,1-2H3,(H,21,24)(H,22,25)/t16-,17+/m1/s1