5-(1,2-dibromo-2-phenyl-ethyl)-2,2-dimethyl-oxazolidin-4-one

2,2,3-trimethyl-5-styryl-oxazolidin-4-one

4-acetoxy-2,2-dimethyl-5-styryl-2,5-dihydro-oxazole

2-hydroxy-4-oxo-2-phenethyl-valeric acid