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. 2019 Dec 10;9:18733. doi: 10.1038/s41598-019-55335-z

Table 1.

The spin labels (free radicals) studied.

Compound Abbreviation Structure
1 2,2,6,6-Tetramethylpiperidine-1-oxyl TEMPO graphic file with name 41598_2019_55335_Figa_HTML.gif
2 4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl TEMPOL graphic file with name 41598_2019_55335_Figb_HTML.gif
3 4-Amino-2,2,6,6-tetramethylpiperidine-1-oxyl 4-Amino-TEMPO graphic file with name 41598_2019_55335_Figc_HTML.gif
4 4-Carboxy-2,2,6,6-tetramethylpiperidine -1-oxyl 4-Carboxy-TEMPO graphic file with name 41598_2019_55335_Figd_HTML.gif