InChI=1S/C21H32O2/c1-14(2)15-7-9-17-16(13-15)8-10-18-20(17,3)11-6-12-21(18,4)19(22)23-5/h13-14,18H,6-12H2,1-5H3/t18?,20?,21-/m0/s1