Description Application 4-Pyridinecarboxaldehyde can be used for the synthesis of: • ʅ,β-Unsaturated amides by coupling with N,N-disubstituted formamides. • meso-Substituted A3-corroles. • N-(4-pyridylmethyl)-L-valine as a ligand to construct zinc metal–organic frameworks (Zn-MOFs). • 4′-Pyridyl terpyridines, with potential application as anticancer and antimicrobial agents. • 4-pyridinecarboxaldehyde thiosemicarbazone, as a corrosion inhibitor for mild steel. Packaging 25, 100, 500 g in glass bottle