InChI=1S/C20H22N2O6/c1-19(2)11-8-10-6-5-7-12-15(10)20(27,18(26)21(12)3)16(11)17(25)22(19)13(23)9-14(24)28-4/h5-7,11,16,27H,8-9H2,1-4H3/t11-,16+,20?/m1/s1