4-Chlorothieno[3,2-d]pyrimidine-6-carboxylic acid

4-cyano-tetrahydropyran-4-carboxylic acid

4-cyclohexyl-3-thiosemicarbazide

4-ethoxy-2-hydroxy-benzaldehyde

4-Fluoro-1,2-benzisoxazol-3-ol

4-Fluoro-α-methylstyrene

4-Formyl-N,N-dimethyl-1H-imidazole-1-sulfonamide

4-Hydroxy- L -isoleucine

4-羟基- L -异亮氨酸

4-hydroxy-6-(trifluoromethoxy)quinoline-3-carboxylic acid

4-Hydroxybutyric acid hydrazide

4-Iodo-3-nitrobenzamide

4-mercaptobutyric acid

4-巯基丁酸

4-Methoxybutanal

4-Methyl-1-oxo-1,2,3,4-tetrahydro-2,4a,5-triaza-fluorene-6-carboxylic acid (1-benzyl-1H-pyrazol-4-yl)-amide

4-Methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride