InChI=1S/C17H17NO9/c19-10(6-8-5-7-3-1-2-4-9(7)18-8)16(25)27-17-13(22)11(20)12(21)14(26-17)15(23)24/h1-6,11-14,17-22H,(H,23,24)/b10-6-