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Reaction between 2‐chloronicotinic acid chloride and 2‐mercaptobenzimidazole afforded 5H‐5‐oxobenzimidazo[2,1‐b]pyrido[3,2‐e][1,3]thiazine, a novel heterocyclic ring system. The assigned structure was confirmed by means of mass spectrometry.
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Belgodere et al. (1984) studied this question.
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