InChI=1S/C21H30O8/c1-10-6-12-7-21(3,9-23)19(27)15(12)11(2)13(10)4-5-28-20-18(26)17(25)16(24)14(8-22)29-20/h6,14,16-18,20,22-26H,4-5,7-9H2,1-3H3