InChI=1S/C21H27N5O2/c22-18(15-16-5-2-1-3-6-16)21(28)26-14-4-7-19(26)20(27)25-13-12-24-17-8-10-23-11-9-17/h1-3,5-6,8-11,18-19H,4,7,12-15,22H2,(H,23,24)(H,25,27)/t18-,19+/m1/s1