for the following products
3-{[2-(2-Carboxyphenyl)-2,3-dihydro-2-hydroxy-3-oxo-4-phenyl-1H-pyrrol-1-yl]-methyl}-2,2,5,5-tetramethyl-1-pyrrolidinyloxy monoptassium salt | 5-(2-Carboxyphenyl)-5-hydroxy-1-((2,2,5,5-tetramethyl-1-oxypyrrolidin-3-yl)-methyl)-3-phenyl-2-pyrrolin-4-one, potassium salt and Proxyl fluorescamine
