Synthesis and some conversions of N-substituted benzimidazole-2-sulfonic acids
Divaeva, L. N.; Kuzmenko, T. A.; Morkovnik, A. S.; Komissarov, V. N.;
Chemistry of Heterocyclic Compounds (New York, NY, United States); 42; 4; 2006; 463 - 468
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http://dx.doi.org/10.1007/s10593-006-0112-4