ethyl 3-chloro-5,6-diphenylpyridazine-4-carboxylate

4-methylcyclohexane-1,1-dicarboxylic acid

ethyl 6-methyl-2-oxochromene-3-carboxylate

1,3-二甲基-2,4,5,6(1H,3H)-嘧啶四酮 5-肟

diethyl 2-(trifluoromethylsulfonyl)propanedioate