(1-氧基-2,2,5,5,-四甲基-?3-吡咯啉)甲醛

1-oxyl-2,2,5,5-tetramethyl-3-n-tridecyl-3-pyrroline

2-(1-oxyl-2,2,5,5-tetramethyl-3-pyrrolin-3-yl)-2-oxopropanoic acid