InChI=1S/C20H28O3/c1-5-19(2)10-8-14-13-7-6-9-20(3,12-21)15(13)11-16(22)17(14)18(19)23-4/h5,11,18,21-22H,1,6-10,12H2,2-4H3/t18-,19+,20+/m1/s1