Citalopram Hydrobromide Impurity - B

1-[3-(Dimethylamino)propyl]-1-(4-fluorophenyl)-3-hydroxy1,3-dihydroisobenzofuran-5-carbonitrile; 
Escitalopram Impurity B (EP/BP); Escitalopram Oxalate Impurity B (Freebase) (EP/BP); mixture of (1RS,3RS)-1-[3-(dimethylamino)propyl]-1-(4- fluorophenyl)-3-hydroxy-1,3-dihydro-2-benzofuran-5-carbonitrile and (1RS,3SR)-1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-3-hydroxy-1,3-dihydro-2-benzofuran-5-carbonitrile; 1-[3-(Dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-3-hydroxy-5-isobenzofurancarbonitrile; 1-[3-(Dimethylamino)propyl]-1-(4-fluorophenyl)-3-hydroxy-1,3dihydroisobenzofuran-5-carbonitrile; 3-Hydroxycitalopram; 1-(3-Dimethylaminopropyl)-1-(4-fluorophenyl)-3-hydroxy-1,3-dihydroisobenzofuran-5-carbonitrile; Citalopram Related Compound B (USP);