p-bis(2,2,6,6-tetramethyl-Δ3-4-piperidylethynyl)benzene

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

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

Benzoic acid 2,2,6,6-tetramethyl-4-trifluoromethanesulfonyloxy-3,6-dihydro-2H-pyridin-1-yl ester

4,4'-(1,4-phenylenebis(ethyne-2,1-diyl))bis(2,2,6,6-tetramethylpiperidin-4-ol)