InChI=1S/C18H17NO8/c1-25-13-5-8(3-4-11(13)20)15-16(27-15)17(22)19-10-7-14(26-2)12(21)6-9(10)18(23)24/h3-7,15-16,20-21H,1-2H3,(H,19,22)(H,23,24)