InChI=1S/C17H21NO9/c19-11-3-4-18-6-8(11)5-9-1-2-10(26-9)7-25-17-14(22)12(20)13(21)15(27-17)16(23)24/h1-2,5-6,11-15,17,19-22H,3-4,7H2,(H,23,24)/b8-5+