Crystal structures of the Schiff base derivatives (<i>E</i>)-<i>N</i>′-[(1<i>H</i>-indol-3-yl)methylidene]isonicotinohydrazide ethanol monosolvate and (<i>E</i>)-<i>N</i>-methyl-2-[1-(2-oxo-2<i>H</i>-chromen-3-yl)ethylidene]hydrazinecarbothioamide
Acta crystallographica. Section E, Crystallographic communications