InChI=1S/C21H32O8/c1-12(5-7-21(27)13(2)9-14(23)10-20(21,3)4)6-8-28-19-18(26)17(25)16(24)15(11-22)29-19/h5-7,9,15-19,22,24-27H,8,10-11H2,1-4H3/b7-5+,12-6+