InChI=1S/C20H28O3/c1-11(2)14-16(21)12-7-8-13-19(3,4)9-6-10-20(13,5)15(12)18(23)17(14)22/h11,13,22H,6-10H2,1-5H3/t13-,20-/m0/s1