for the following products
4-[(trans,trans)-4'-ethyl[1,1'-bicyclohexyl]-4-yl]-1,2-difluorobenzene | trans-4-(3,4-Difluorophenyl)-trans-4'-ethylbicyclohexane | trans-4-Ethyl-trans-4'-(3,4-difluorophenyl)bicyclohexyl and trans,trans-4-(3,4-Difluorophenyl)-4'-ethylbicyclohexyl
