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