Imatinib Carboxylic Impurity

4-((4-methylpiperazin-1-yl)methyl)benloride;|4-((4-Methylpiperazin-1-yl)methyl)benzoic acid dihydrochloride ;|4-(4-Methylpiperazinomethyl)benzoic Acid, Dihydrochloride;|4-[(4-methyl-1-piperazinyl)methyl]benzoic acid dihydrochloride|4-[(4-Methyl-1-piperazinyl)methyl]benzoic Acid Dihydrochloride;|4-[(4-Methylpiperazin-1-yl)methyl]benzoic acid dihydrochloride;|Imatinib Carboxylic Impurity;|Imatinib Mesylate intermediate;