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Dyachenko, V. D., Krivokolysko, S. G., & Litvinov, V. P. (1996). Synthesis of 2,6-diamino-3,5-dicyano-4-ethyl-4H-thiopyran and its recyclization to 6-amino-3,5-dicyano-4-ethylpyridine-2(1H)-thione. Chemistry of Heterocyclic Compounds, 32(8), 947–951. doi:10.1007/bf01176972 
10.1007/bf01176972