InChI=1S/C21H26O7/c1-25-17-7-5-12(8-19(17)27-3)20(24)15-11-28-21(14(15)10-22)13-4-6-16(23)18(9-13)26-2/h4-9,14-15,20-24H,10-11H2,1-3H3/t14-,15+,20-,21+/m1/s1