(4Z)-4-[(4-nitrophenyl)hydrazinylidene]pentanoic acid

2-(1-benzoyl-5-methoxy-2-methylindol-3-yl)acetic acid

methyl 5-azido-4-oxopentanoate

1,5-二甲基-2-吡咯烷酮

5-甲基-2-吡咯酮