Synonym(s): 4-Carboxy-2,2,6,6-tetramethylpiperidine 1-oxyl; 4-Carboxy-2,2,6,6-tetramethylpiperidinyloxy, free radical; 4-Carboxy-TEMPO Formula: C10H18NO3 Formula Weight: 200.25 CAS No.: 37149-18-1 Purity: 97% Storage: 2-8°C Packaging: 250 mg in glass bottle