吡咪唑

4-[2-(2,4-dioxopentan-3-ylidene)hydrazinyl]benzoic acid

ethyl 4-acetyl-5-anilino-3-methylthiophene-2-carboxylate

3-ethyl-3-methylpentane-2,4-dione

3-(2,2,2-trichloro-1-hydroxyethyl)pentane-2,4-dione