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3-Pyridin-4-yl-propionic acid

3-Pyridin-2-yl-propionic acid

2-Amino-5-nitronicotinic acid ethyl ester

4-(4-Pyridyl)benzaldehyde

3-(2-Pyridinyl)benzaldehyde

3-Pyrid-4-ylbenzaldehyde

5-Nitro-2-(2-pyridylthio)benzaldehyde

4-(6-Bromopyridin-2-yl)benzaldehyde

2-p-Tolyl imidazo[1,2-a]pyridine-3-carbaldehyde

2-(3-Hydroxycarbonyl-6-pyridyl)malondialdehyde