InChI=1S/C21H26O8/c1-6-21(10-23)7-15(28-19(25)11(2)8-22)16-13(4)20(26)29-18(16)17(21)12(3)9-27-14(5)24/h6,15-18,22-23H,1-4,7-10H2,5H3/t15-,16+,17+,18-,21+/m0/s1