Synonyms: 2,2,5,5-Tetramethyl-3-carbamidopyrroline-1-oxyl; 2,2,5,5-Tetramethyl-3-pyrrolin-1-yloxy-3-carboxamide; 3-Carbamoyl-2,2,5,5-tetramethyl-3-pyrrolin-1-yloxy, free radical; 3-carbamoyl-2,5-dihydro-2,2,5*5-tetramethyl-1H-py; 2,2,5,5-Tetramethyl-3-pyrrolin-1-oxyl-3-carboxamide