InChI=1S/C19H19NO8/c1-26-14-9-12(11(19(24)25)8-13(14)21)20-17(22)5-4-10-6-15(27-2)18(23)16(7-10)28-3/h4-9,21,23H,1-3H3,(H,20,22)(H,24,25)