InChI=1S/C31H32N4O4/c1-21(36)34-28(18-23-12-14-25(37)15-13-23)31(39)35(2)29(19-22-8-4-3-5-9-22)30(38)32-17-16-24-20-33-27-11-7-6-10-26(24)27/h3-17,20,28-29,33,37H,18-19H2,1-2H3,(H,32,38)(H,34,36)/b17-16+/t28-,29-/m0/s1