InChI=1S/C18H17NO8/c1-26-14-8-11(10(18(24)25)7-12(14)20)19-16(22)4-3-9-5-13(21)17(23)15(6-9)27-2/h3-8,20-21,23H,1-2H3,(H,19,22)(H,24,25)