1,3-Dihydro-1-(4-piperidinyl)-2H-benzimidazol-2-one ; 1-(Piperidin-4-yl)-2,3-dihydro-1H-1,3-benzodiazol-2-one ; 4-(2-Oxo-1,3-dihydro-2H-benzimidazol-1-yl)piperidine ; 4-(2-Oxo-1,3-dihydrobenzimidazol-1-yl)piperidine ; 4-(2-Oxo-1-benzimidazolinyl)piperidine ; 1-(Piperidin-4-yl)-1,3-dihydro-benzoimidazol-2-one ; 1-(Piperidin-4-yl)-1H-1,3-benzodiazol-2-ol ; 1-(Piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one ; 1-(Piperidin-4-yl)-1H-benzo[d]imidazol-2-ol ; 1,3-Dihydro-1-(4-piperidinyl)benzimidazol-2-one ; 1-(4-Piperidinyl)-1,3-dihydro-2H-benzimidazol-2-one ; 1-(4-Piperidinyl)-1,3-dihydrobenzimidazol-2-one ; 1-(4-Piperidinyl)-1H-benzimidazol-2(3H)-one ; 1-(4-Piperidinyl)-2-benzimidazolinone ; 1-(Piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one ; Benperidol EP Impurity A;