InChI=1S/C20H28O2/c1-3-20(22)11-9-18-17-6-4-13-12-14(21)5-7-15(13)16(17)8-10-19(18,20)2/h3,12,15-18,22H,1,4-11H2,2H3/t15-,16+,17+,18-,19-,20-/m0/s1