methyl 6-oxohepta-2,4-dienoate

methyl 6-oxo-2(E),4(Z)-heptadienoate

2,5-二氢-2,5-二甲氧基-2-甲基呋喃

(Z)-4-oxopent-2-enal

6-oxo-hepta-2t,4t-dienal