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