InChI=1S/C14H15NO7/c1-22-11-6-8(2-4-10(11)16)3-5-12(17)15-9(14(20)21)7-13(18)19/h2-6,9,16H,7H2,1H3,(H,15,17)(H,18,19)(H,20,21)/b5-3+