(furan-2,5-diylbis(ethyne-2,1-diyl))bis(2,2,6,6-tetramethyl-3,6-dihydropyridine-4,1(2H)-diyl) dibenzoate

p-bis(1-oxyl-2,2,6,6-tetramethyl-Δ3-4-piperidylethynyl)benzene

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

bis(1-oxyl-2,2,6,6-tetramethyl-Δ3-piperidyl-4)-acetylene

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