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The title compound, C9H12N2O3, was synthesized by the reaction in ethanol of ethane-1,2-di­amine and 3-[bis­(methyl­thio)­methyl­ene]-6-methyl-3,4,5,6-tetra­hydro-2H-pyran-2,4-dione. Two intramolecular N—H...O hydrogen bonds induce a high degree of planarity.

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The title compound, C15H16N2O2S, which is a potentially new bioactive mol­ecule containing pyrazole and pyrone ring systems, was synthesized by the reaction of 1-p-tolyl­hydrazine and 3-[bis­(methyl­thio)methyl­ene]dihydro-6-meth­yl-3H-pyran-2,4-dione in ethanol.

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The title compound, C15H14N2O3S, a potent new bioactive mol­ecule which contains pyrazole and pyrone ring systems, was synthesized by the reaction of benzohydrazide and 3-[bis­(methyl­sulfan­yl)methyl­ene]dihydro-6-methyl-3H-pyran-[2,4-dione in ethanol.
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