InChI=1S/C14H17NO7/c1-14(2,21)9-4-6-11(19)8(16)3-7(12(6)22-9)13(20)15-5-10(17)18/h3,9,16,19,21H,4-5H2,1-2H3,(H,15,20)(H,17,18)