Escitalopram EP Impurity C

: Citalopram EP Impurity C; 3-Oxo Citalopram; 3-[3-(Dimethylamino)-1-propyl](4-fluorophenyl)-6-cyano-1(3H)-isobenzofuranone; 1-[3-(Dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-3-oxo- 5-isobenzofurancarbonitrile;