[3-(dimethylamino)-2-(dimethylazaniumylidenemethyl)prop-2-enylidene]-dimethylazanium,diperchlorate

3-(2,3-dimethylphenyl)prop-2-enoic acid

3-(4-acetylphenyl)prop-2-enoic acid

2H-吡啶并[1,2-a]嘧啶-2,4(3H)-二酮

6-Chloro-7-hydroxy-2-oxo-2H-chromene-3-carboxylic acid