InChI=1S/C20H28O6/c1-9-7-20-8-10(9)11(21)6-12(20)18(2)5-4-13(22)19(3,17(25)26)15(18)14(20)16(23)24/h10-15,21-22H,1,4-8H2,2-3H3,(H,23,24)(H,25,26)