InChI=1S/C21H24N2O4/c1-11(24)14-9-27-10-15-13(14)7-19-21(8-17(15)22-19)16-5-4-12(26-3)6-18(16)23(2)20(21)25/h4-6,9,13,15,17,19,22H,7-8,10H2,1-3H3/t13-,15+,17-,19-,21+/m0/s1