1-Piperidinyloxy, 4-((4-carboxybutyl)methylamino)-2,2,6,6-tetramethyl- 139116-76-0 4-(N-Carboxybutyl-N-methylamino)-2,2,6,6-tetramethylpiperidine-1-oxyl 4-(N-Carboxybutyl-N-methylamino)-tempo 4-Cbma-tempo