Figure 1.
Structures of (A) 2,2,6,6-tetramethyl-4-piperidone-1-oxide; (B) 5-4-hydantoin-2,2,6,6-tetramethyl-4-piperidone-1-oxide; and (C) 3-carbamoyl-2,2,5,5-tetramethyl-3-pyrrolin-1-yloxy.
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