Synthesis of Pyridazine Derivatives with Sulfur-Containing Substituent. IV. The Concurrent Formation of Dipyridazo [3, 4-b : 3', 4'-e]-1, 4-dithiin and Dipyridazo [3, 4-b : 4', 3'-e]-1, 4-dithiin Derivatives by Starting with 3-Chloro-4-mercapto-5-substituted Pyridazines. (3)
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