tert-butyl 5-hydroxy-4-methoxypent-2-enoate

tert-butyl 5-chloro-3-oxopentanoate

tert-butyl 3-oxopent-4-enoate

5-O-tert-butyl 1-O-ethyl 3-methylpentanedioate

反式-4-癸烯酸