1-N-(2,2,6,6-Tetramethyl-1-oxyl-4-piperidinyl) 5-N-(1-aspartate)-2,4-dinitrobenzene 1-Piperidinyloxy, 4-((5-((1,2-dicarboxyethyl)amino)-2,4-dinitrophenyl)amino)-2,2,6,6-tetramethyl-, (S)- 66920-38-5