nitrile organofluorine compound cyclic ether 2-benzofurans tertiary amino compound 1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2-benzofuran-5-carbonitrile A nitrile that is 1,3-dihydro-2-benzofuran-5-carbonitrile in which one of the hydrogens at position 1 is replaced by a p-fluorophenyl group, while the other is replaced by a 3-(dimethylamino)propyl group. 3-[5-cyano-1-(4-fluorophenyl)-1,3-dihydro-2-benzofuran-1-yl]-N,N-dimethylpropan-1-aminium