InChI=1S/C17H21NO8/c19-12-13(20)15(16(22)23)26-17(14(12)21)24-8-11-4-3-10(25-11)6-9-2-1-5-18-7-9/h3-4,6-7,12-15,17,19-21H,1-2,5,8H2,(H,22,23)/b9-6-