( ⅲ ) 12 -( bis ( 4 - butoxyphenyl ) ( cyclopenta - 2 , 4 - dien - 1 - yl ) methyl ) - 1 , 1 , 4 , 4 , 7 , 7 , 10 , 10 - octamethyl - 2 , 3 , 4 , 7 , 8 , 9 , 10 , 12 - octahydro - 1 H - dibenzo [ b , h ] fluorene 의 합성