InChI=1S/C21H28N2O5/c1-14(6-11-18(25)22-21(3,13-24)20(27)28)12-15(2)19(26)16-7-9-17(10-8-16)23(4)5/h6-12,15,24H,13H2,1-5H3,(H,22,25)(H,27,28)/b11-6+,14-12+/t15-,21-/m1/s1