3-Hydroxy CitalopraM;1-[3-(DiMethylaMino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-3-hydroxy-5-isobenzofurancarbonitrile;CitalopraM EP IMpurity B;Citalopram Hydrochloride EP Impurity B;Citalopram EP Impurity B (USP RC B);1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-3-hydroxy-3H-2-benzofuran-5-carbonitrile;Citalopram EP Imp B;Citalopram Impurity 4(Citalopram EP Impurity B)