Ethyl 3-oxo-2-(phenylhydrazono)butanoate

1-Ethoxy-2-(2-phenylhydrazono)-1,3-butanedione

2-(2-Phenylhydrazono)-3-oxobutyric acid ethyl ester

3-Oxo-2-(2-phenylhydrazono)butyric acid ethyl ester

3-Oxo-2-(2-phenylhydrazono)butanoic acid ethyl ester

2-(2-Phenylhydrazono)-3-oxobutanoic acid ethyl ester