(S)-3-(4-hydroxy-phenyl)-hex-4-ynoic acid ethyl ester
(3S)-3-(4-hydroxy-phenyl)-hex-4-ynoic acid
(+/-)-5-[1-(4-hydroxy-phenyl)-but-2-ynyl]-2,2-dimethyl-[1,3]dioxane-4,6-dione
4-hydroxy-β-1-propyn-1-ylbenzenepropanoic acid
5-(4-hydroxy-benzylidene)-2,2-dimethyl-[1,3]dioxane-4,6-dione