methyl 5-hydroxy-3-oxohept-6-enoate

methyl 3-oxooct-6-ynoate

2-diazonio-1-methoxy-7-methyl-3-oxoocta-1,6-dien-1-olate

methyl 2,2-bis(2-cyanoethyl)-3-oxobutanoate

methyl 3-oxotetradeca-6,8-dienoate