InChI=1S/C21H30O2/c1-5-6-7-8-14-11-17-19-15-13-21(4,23-18(19)12-14)10-9-16(15)20(2,3)22-17/h11-12,15-16H,5-10,13H2,1-4H3/t15-,16-,21-/m0/s1