InChI=1S/C21H19NO6/c1-7-6-10(23)12-13-11(7)19-21(26,20(4,5)8(2)27-19)18(25)14(13)16(24)15-17(12)28-9(3)22-15/h6,8,23,26H,1-5H3/t8-,21+/m0/s1