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methyl 5-nitro-1H-benzo[d]imidazole-2-carboxylate; CAS No.: 93521-65-4; As a chemical online mall, we supply nitrobenzimidazole esters for corrosion inhibitor synthesis. The 5-nitro group and methyl ester enable metal surface passivation. Our cyclocondensation achieves regioselective benzimidazole formation. This product serves petrochemical industries in developing high-temperature corrosion inhibitors for pipeline protection.