Methyl 5-chlorosalicylate is an organic compound with the molecular formula C8H7ClO3. It is a methyl ester derivative of 5-chlorosalicylic acid, featuring both a phenolic hydroxyl group and a chloro substituent on the aromatic ring. This structure makes it a versatile bifunctional building block. This compound is primarily used as a key pharmaceutical intermediate. It serves as a crucial precursor in the synthesis of various active pharmaceutical ingredients (APIs), particularly in the development of non-steroidal anti-inflammatory drugs (NSAIDs) and other therapeutic agents where the salicylate or chlorinated aromatic core is required. Its bifunctionality allows for selective modifications at either the ester or the phenolic group. As a synthetic intermediate, it is also employed in organic research and material science for constructing more complex molecules. Standard safety precautions for handling organic chemicals should be observed, including the use of personal protective equipment due to its potential irritant properties.