InChI=1S/C20H23N3O7/c1-9-8-13(10-2-3-10)23-20(21-9)22-11-4-6-12(7-5-11)29-19-16(26)14(24)15(25)17(30-19)18(27)28/h4-8,10,14-17,19,24-26H,2-3H2,1H3,(H,27,28)(H,21,22,23)