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Chemistry of kojic acid: One-step syntheses of benzothiazoles and other fused heterocycles from kojic acid derivatives
Australian Journal of Chemistry 1983 36(11) 2307 - 2315
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http://www.publish.csiro.au/nid/51/paper/CH9832307.htmRearrangement of a Pyranone to a Benzothiazole
J. HETEROCYCL. CHEM., 1980, 17, NO 4, 817-818
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https://www.jhetchem.com/cd2html.php?file=19800817