Aceclofenac is a monocarboxylic acid that is the carboxymethyl ester of diclofenac. A non-steroidal anti-inflammatory drug related to diclofenac, it is used in the management of osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. It has a role as an EC (prostaglandin-endoperoxide synthase) inhibitor, a non-steroidal anti-inflammatory drug and a non-narcotic analgesic. It is a monocarboxylic acid, a carboxylic ester, a secondary amino compound, an amino acid and a dichlorobenzene. It derives from a diclofenac.