First Synthesis of 3-Mercapto-2(1 H )-pyridinone, a Simple Disubstituted Pyridine Useful for Synthesis of the 4-Azaphenoxathiine Ring System and Its Novel Diazaphenoxathiine Analogs:  1,6-Diazaphenoxathiine and 2,6-Diazaphenoxathiine 1

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