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