InChI=1S/C27H35N3O7/c1-36-23-18-20(6-8-21(23)31)7-9-25(33)29-16-4-3-14-28-15-5-17-30-26(34)11-13-27(35)12-10-22(32)24(19-27)37-2/h6-13,18-19,28,31,35H,3-5,14-17H2,1-2H3,(H,29,33)(H,30,34)/b9-7?,13-11+