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