InChI=1S/C28H32N4O4/c33-25-23-13-8-16-32(23)28(36)22(18-20-11-5-2-6-12-20)30-26(34)24-14-7-15-31(24)27(35)21(29-25)17-19-9-3-1-4-10-19/h1-6,9-12,21-24H,7-8,13-18H2,(H,29,33)(H,30,34)/t21-,22-,23-,24-/m0/s1