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)

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

4,4'-(furan-2,5-diylbis(ethyne-2,1-diyl))bis(2,2,6,6-tetramethyl-3,6-dihydropyridin-1(2H)-ol)

4,4'-(thiophene-2,5-diylbis(ethyne-2,1-diyl))bis(2,2,6,6-tetramethyl-3,6-dihydropyridin-1(2H)-ol)