2,2,5,5-tetramethyl-2,5-dihydropyrrole-3-carboxylic acid ethyl ester

3,5-dibromo-1-hydroxy-4-oxo-2,2,6,6-tetramethylpiperidine hydrobromide

3r,5c-dibromo-2,2,6,6-tetramethyl-piperidin-4-one, hydrobromide

2,6-二甲基-2,5-庚二烯-4-酮