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(1980)bis(1-oxyl-2,2,6,6-tetramethyl-Δ3-4-piperidyl-p-ethynylphenyl)butadiyne
4-hydroxy-4-(phenyl-p-butadiynylphenylethynyl)-2,2,6,6-tetramethylpiperidin-1-oxyl
4-(phenyl-p-butadiynylphenylethynyl)-2,2,6,6-tetramethyl-Δ3-piperidin-1-oxyl
4-(p-ethynylphenylethynyl)-2,2,6,6-tetramethyl-Δ3-piperidin-1-oxyl
4-hydroxy-4-(p-ethynylphenylethynyl)-2,2,6,6-tetramethylpiperidin-1-oxyl