InChI=1S/C21H25NO9/c1-20(30)7-4-5-8(23)16(26)11(7)17(27)12-13(20)18(28)14-15(22(2)3)9(24)6-10(25)21(14,31)19(12)29/h4-5,9,12-15,18,23-24,26,28,30-31H,6H2,1-3H3/t9?,12?,13?,14?,15?,18?,20-,21+/m1/s1