InChI=1/C15H19N3O3/c1-9-7-18(8-15(2,3)21-9)13(19)10-4-5-11-12(6-10)17-14(20)16-11/h4-6,9H,7-8H2,1-3H3,(H2,16,17,20)/t9-/m1/s1/f/h16-17H D2797D79F507C508