InChI=1S/C18H17NO7/c1-24-10-5-3-4-9(6-10)15-16(26-15)17(21)19-12-8-14(25-2)13(20)7-11(12)18(22)23/h3-8,15-16,20H,1-2H3,(H,19,21)(H,22,23)