1-Piperidinyloxy, 4-((5-((3-carboxypropyl)amino)-2,4-dinitrophenyl)amino)-2,2,6,6-tetramethyl- 1-gamma-Aminobutyrate-5-N-(1-oxyl-2,2,6,6-tetramethyl-4-aminopiperidinyl)-2,4-dinitrobenzene 63677-34-9