InChI=1S/C21H32O7/c1-11-5-4-7-21(3)8-6-13(9-14(11)21)12(2)10-27-20-17(24)15(22)16(23)18(28-20)19(25)26/h13-18,20,22-24H,1-2,4-10H2,3H3,(H,25,26)