InChI=1S/C17H17NO9/c19-10-3-1-2-9-8(10)6-7(18-9)4-5-11(20)26-17-14(23)12(21)13(22)15(27-17)16(24)25/h1-6,12-15,17-19,21-23H,(H,24,25)/b5-4+