InChI=1S/C21H19NO5/c1-11(23)22-8-7-13-9-16-21(26-10-25-16)18-14-5-3-4-6-15(14)20(27-12(2)24)19(22)17(13)18/h3-6,9,19-20H,7-8,10H2,1-2H3/t19-,20+/m0/s1