InChI=1S/C27H35N3O7/c1-36-23-18-19(6-10-21(23)31)7-12-24(33)29-16-4-3-14-28-15-5-17-30-25(34)13-9-20-8-11-22(32)27(37-2)26(20)35/h6-13,18,28,31-32,35H,3-5,14-17H2,1-2H3,(H,29,33)(H,30,34)/b12-7?,13-9+