InChI=1S/C22H26N2O4/c23-20(24)4-2-1-3-17(22(27)28)21-18-11-14(5-6-15(18)12-19(21)26)13-7-9-16(25)10-8-13/h5-11,17,19,21,25-26H,1-4,12H2,(H3,23,24)(H,27,28)/t17-,19+,21+/m1/s1