InChI=1S/C21H23N3O4/c1-9(22)13-17(25)16-15-11(20(2,3)24(16)18(13)26)8-10-6-5-7-12-14(10)21(15,28)19(27)23(12)4/h5-7,11,15-16,22,25,28H,8H2,1-4H3/t11-,15+,16+,21+/m1/s1