InChI=1S/C26H28N4O4/c31-22-18(14-16-8-2-1-3-9-16)27-23(32)19(28-22)15-26(34)17-10-4-5-11-20(17)30-24(33)21-12-6-7-13-29(21)25(26)30/h1-5,8-11,18-19,21,25,34H,6-7,12-15H2,(H,27,32)(H,28,31)/t18-,19-,21-,25-,26+/m0/s1