InChI=1S/C20H28O4/c1-11(2)14-16(22)12-6-7-13-19(3,10-21)8-5-9-20(13,4)15(12)18(24)17(14)23/h11,13,21,23H,5-10H2,1-4H3/t13-,19+,20-/m0/s1