InChI=1S/C21H32O4/c1-13(2)8-7-11-21(25)16(10-9-14(3)4)19(23)18(20(21)24)17(22)12-15(5)6/h8-9,15-16,24-25H,7,10-12H2,1-6H3/t16-,21-/m0/s1