4-oxo-4H-chromene-3-carbaldehyde phenylhydrazone

3-[(4-oxochromen-3-yl)methylidene]pentane-2,4-dione

ethyl 2-cyano-3-(4H-1-benzoypyran-4-one-3-yl)-acrylate

[(4-oxo-4H-chromen-3-yl)methylidene]-propanedinitrile

3-N,N-dimethylhydrazonomethyl-4(H)-oxo-<1>benzopyran