InChI=1S/C21H34O7/c1-10(2)12-7-9-21(4)8-5-6-11(3)13(21)17(12)27-20-16(24)14(22)15(23)18(28-20)19(25)26/h10,12-18,20,22-24H,3,5-9H2,1-2,4H3,(H,25,26)