InChI=1S/C14H21N3O4/c1-9-7-17(14(20)15-13(9)19)12-6-10(18)11(21-12)8-16-4-2-3-5-16/h7,10-12,18H,2-6,8H2,1H3,(H,15,19,20)/t10-,11+,12+/m1/s1