2-cyclohexyl-4,8-dimesityl-6,6-dimethyl-1-oxa-4,8-diazaspiro[2.5]octane-5,7-dione

α-chloro-p-fluorobenzyl acetate

2-(4-fluorophenyl)-2-oxoacetic acid

4-Carboxy-N-(4-fluor-benzyliden)-anilin