5-甲氧基呋喃-2(5h)-酮

(2E,4E)-6-[(Z)-5-methoxy-3-methyl-5-oxopent-3-enoxy]-6-oxohexa-2,4-dienoic acid

6-oxo-6-(2-trimethylsilylethoxy)hexa-2,4-dienoate

(2E)-4-Oxo-2-butenoic acid

5-hydroxyoxolan-2-one