Synonyms: 2,2,5,5-TETRAMETHYL-4-PHENYL-3-IMIDAZOLINE-1-OXYL;2,2,5,5-TETRAMETHYL-4-PHENYL-3-IMIDAZOLINE-1-OXYL, FREE RADICAL;4-PHENYL-2,2,5,5-TETRAMETHYL-3-IMIDAZOLIN-1-YLOXY;4-PHENYL-2,2,5,5-TETRAMETHYL-3-IMIDAZOLI N-1-YLOXY, FREE RADICAL, 98%;(4-Phenyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-imidazole-1-yloxy)radical;[4-Phenyl-2,2,5,5-tetramethyl-3-imidazolin-1-yloxy]radical;4-Phenyl-2,2,5,5-tetramethylimidazoline-1-oxyl