Scheme 3.
Preparation of 1-((5-nitro-1H-benzo[d]imidazol-2-yl) methyl) pyridin-1-ium chloride 9 and 2-((5-nitro-1H-benzo[d]imidazol-2-yl) methyl) isoquinolin-2-ium chloride 10.
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