InChI=1S/C21H32O4/c1-13(2)6-5-7-14(3)15-10-11-21(4,25)17(15)12-16-18(22)8-9-19(23)20(16)24/h6,10,14,17,19,23-25H,5,7-9,11-12H2,1-4H3