InChI=1S/C20H23NO9/c21-9-13(11-29-16(24)6-3-12-1-4-14(23)5-2-12)7-8-28-20-19(27)18(26)17(25)15(10-22)30-20/h1-7,15,17-20,22-23,25-27H,8,10-11H2/b6-3+,13-7-