InChI=1S/C16H20N2O9/c17-7(15(23)24)5-9(19)6-3-1-2-4-8(6)18-14-12(22)10(20)11(21)13(27-14)16(25)26/h1-4,7,10-14,18,20-22H,5,17H2,(H,23,24)(H,25,26)