5-(2-Fluoro-pyridin-4-yl)-furan-2-carboxylic acid

5-(2-Carboxypyridin-4-yl)-furan-2-carboxylic acid

5-(6-Chloropyridazin-3-yl)-furan-2-carboxylic acid

5-(6-Methylpyridazin-3-yl)-furan-2-carboxylic acid

5-(6-Methoxypyridazin-3-yl)-furan-2-carboxylic acid

5-(2-(Methoxycarbonyl)pyridin-4-yl)-furan-2-carboxylic acid