2',3'-O-(1-acetoxy-2,2,6,6-tetramethyl-4-piperidylidene)-5'-O-benzoyluridine

4,4'-(ethyne-1,2-diyl)bis(2,2,6,6-tetramethyl-3,6-dihydropyridin-1(2H)-ol)

4,4'-(1,3-phenylenebis(ethyne-2,1-diyl))bis(2,2,6,6-tetramethyl-3,6-dihydropyridin-1(2H)-ol)

Acetic acid 4-[4-(1-acetoxy-4-hydroxy-2,2,6,6-tetramethyl-piperidin-4-ylethynyl)-phenylethynyl]-4-hydroxy-2,2,6,6-tetramethyl-piperidin-1-yl ester

Acetic acid 4-[3-(1-acetoxy-4-hydroxy-2,2,6,6-tetramethyl-piperidin-4-ylethynyl)-phenylethynyl]-4-hydroxy-2,2,6,6-tetramethyl-piperidin-1-yl ester