InChI=1S/C20H24O2/c1-12(2)17-10-16-8-6-13(3)5-7-15-9-14(4)11-20(22,18(15)16)19(17)21/h6,8,10,12,22H,4-5,7,9,11H2,1-3H3/b13-6-,16-8-/t20-/m0/s1