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