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