InChI=1S/C17H17NO8/c19-11(6-5-9-7-8-3-1-2-4-10(8)18-9)25-17-14(22)12(20)13(21)15(26-17)16(23)24/h1-7,12-15,17-18,20-22H,(H,23,24)/b6-5+