2,5-Dichlorobenzaldehyde (CAS 6361-23-5) has a molecular formula of C?H?Cl?O and a molecular weight of 175.01 g/mol, with two chloro substituents at the C2 and C5 positions of the benzaldehyde ring. As a key aromatic aldehyde intermediate, it is widely used in synthesizing pharmaceuticals, agrochemicals, and specialty dyes. It requires sealed storage in a cool, dry place to prevent moisture absorption or oxidation, maintaining its chemical stability for synthetic applications.