InChI=1S/C16H19N3O4/c1-9(2)16(23)14(21)18-15(22,13(20)19-16)7-10-8-17-12-6-4-3-5-11(10)12/h3-6,8-9,17,22-23H,7H2,1-2H3,(H,18,21)(H,19,20)/t15-,16-/m1/s1