InChI=1/C14H15NO7/c16-10-4-1-8(7-11(10)17)2-5-12(18)15-9(14(21)22)3-6-13(19)20/h1-2,4-5,7,9,16-17H,3,6H2,(H,15,18)(H,19,20)(H,21,22)/b5-2+