6-((1E,3E,5E)-hepta-1,3,5-trien-1-yl)-4-hydroxy-2H-pyran-2-one

(3E,5E,7E,9E,11E,13E)-pentadeca-3,5,7,9,11,13-hexaen-2-one

3-oxohexadeca-4,6,8,10,12,14-hexaenoic acid

苯甲酰乙酸

4-hydroxy-6-(2-oxopropyl)pyran-2-one