Synonyms: 4-PHENACYLIDENE-2,2,5,5-TETRAMETHYLIMIDAZOLIDIN-1-YLOXY;2,2,5,5-TETRAMETHYL-4-PHENACETYLIDENIMIDAZOLIDINE-1-OXYL;2,2,5,5-TETRAMETHYL-4-PHENACETYLIDEN IMIDAZOLIDINE-1-OXYL FREE RADICAL;4-Phenacylidene-2,2,5,5-tetramethylimidazolidin-1-yloxy,free radical;2,2,5,5-Tetramethyl-4-phenacetylideneimidazolidine-1-oxyl;4-PHENACYLIDENE-2,2,5,5-TETRAMETHYLIMIDAIZOLIDIN-1-YLOXY, FREE RADICAL);2,2,5,5-TETRAMETHYL-4-PHENACETYLIDEN-IMIDAZOLIDINE-1-OXYL, 99%, FREE RADICAL