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