ethyl 5-[1-(benzenesulfonyl)-4-oxocyclohex-2-en-1-yl]pentanoate

1-(4-甲氧基-苯基)-4-苯基-1,4-丁二酮

ethyl 5-(4-acetylphenyl)pentanoate

ethyl 5-[(5-ethoxy-5-oxopentyl)-ethylamino]pentanoate

6-(2-oxoimidazolidin-4-yl)hexanoic acid