J. Chem. Soc., Perkin Trans. 1, 1978, 558 - 561
Addition reaction of 2-iminocyclopentanedithiocarboxylic acid with Schiff's bases: a novel route to the synthesis of 1,3-thiazine derivatives
Naoaki Fukada, Masahide Kato, Hitoshi Seki, Masayuki Kawana and Tatsuo Takeshima
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http://dx.doi.org/10.1039/P19780000558