• Any of a class of organic chemical compounds containing an aromatic ring containing one sulfur atom, one nitrogen atom, and four carbon atoms. Thiazines are often used in making dyes, drugs, and insecticides.
  • A six-membered <xref>heterocycle</xref> containing four <xref>carbon</xref> atoms, one <xref>nitrogen</xref> and one <xref>sulfur</xref> atom, and two <xref>double bonds</xref>; many of its derivatives have important applications
  • a compound made up of a ring of four carbon atoms and one sulfur atom and one nitrogen atom
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