5,6-bis(4-methylphenyl)-2,3-dihydropyrazine

ethyl 2-(4-bromo-2-fluorophenyl)acetate

4-乙基-2-吡啶甲腈

ethyl 4,5-diamino-5-oxopentanoate,hydrochloride

4-chloro-5-ethoxy-2-ethylpyridazin-3-one