Crystal structures of two hydrazinecarbothioamide derivatives: ( E )- N -ethyl-2-[(4-oxo-4 H -chromen-3-yl)methylidene]hydrazinecarbothioamide hemihydrate and ( E )-2-[(4-chloro-2 H -chromen-3-yl)methylidene]- N -phenylhydrazinecarbothioamide

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