3-氨基-2,2,5,5-四甲基-1-吡咯烷酮

2,2,5,5-四甲基-2,5-二氢-1H-吡咯-3-羧酸

2,2,5,5-四甲基-3-吡咯烷羧酰胺

2,2,5,5-四甲基-1-吡咯烷基氧基

1-hydroxy-2,2,5,5-tetramethylpyrrole-3-carboxamide