1,1'-[(1,3-dihydro-2-oxo-2H-benzimidazol-1,3-diyl)-3,1-propanediyldi-1,4-piperidinediyl]bis[5-chloro-1,3-dihydro-2Hbenzimidazol-2-one],1,1'-[(1,3-dihydro-2-oxo-2H-benzimidazol-1,3-diyl)-3,1-propanediyldi-1,4-piperidinediyl]bis[5-chloro-1,3-dihydro-2Hbenzimidazol-2-one],Domperidone Impurity