InChI=1S/C20H28O6/c1-6-10(2)18(22)25-13-9-20(4)14(21)8-7-12(24-5)16(20)17-15(13)11(3)19(23)26-17/h6,12-17,21H,3,7-9H2,1-2,4-5H3