InChI=1S/C25H28N2O7/c1-13(12-28)10-11-15-6-4-8-17-19(15)27-20-16(7-5-9-18(20)26-17)24(31)34-25-23(32-3)22(30)21(29)14(2)33-25/h4-10,14,21-23,25,28-30H,11-12H2,1-3H3/b13-10+/t14-,21-,22+,23+,25+/m0/s1