Crystal structures of two hydrazinecarbothioamide derivatives: (<i>E</i>)-<i>N</i>-ethyl-2-[(4-oxo-4<i>H</i>-chromen-3-yl)methylidene]hydrazinecarbothioamide hemihydrate and (<i>E</i>)-2-[(4-chloro-2<i>H</i>-chromen-3-yl)methylidene]-<i>N</i>-phenylhydrazinecarbothioamide
Acta crystallographica. Section E, Crystallographic communications