InChI=1S/C15H18N2O3/c1-9(2)14(15(19)20)17-13(18)7-10-8-16-12-6-4-3-5-11(10)12/h3-6,8-9,14,16H,7H2,1-2H3,(H,17,18)(H,19,20)/t14-/m0/s1