(E)-4-(cinnamoylmethylene)-2-methoxybut-2-en-4-olide

1-methyl-1,3-bis(trimethylsilyloxy)buta-1,3-diene

(E)-3-methoxy-5-(2-((trimethylsilyl)oxy)allylidene)furan-2(5H)-one

3-hydroxy-5-(2-oxo-4-phenylbut-3-enylidene)-5H-furan-2-one

(E)-5-(4-hydroxy-2-oxo-4-phenylbutylidene)-3-methoxyfuran-2(5H)-one