3-bromo-5-ethoxy-5-oxo-3-pentenal

ethyl-3-bromo-5-oxopent-2-enoate

ethyl 3-bromo-2-en-5-oxopentanoate

ethyl 3-bromo-5-oxo-2-pentenoate

3-bromo-1-ethoxy-5-oxo-2-pentenal