InChI=1S/C21H32O7/c1-10(2)13-8-21(4)11(3)15(6-5-12(21)7-14(13)23)27-20-19(26)18(25)17(24)16(9-22)28-20/h7,11,15-20,22,24-26H,5-6,8-9H2,1-4H3