Carprofen
Carprofen is propanoic acid in which one of the methylene hydrogens is substituted by a 6-chloro-9H-carbazol-2-yl group. A non-steroidal anti-inflammatory drug, it is no longer used in human medicine but is still used for treatment of arthritis in elderly dogs. It has a role as a non-steroidal anti-inflammatory drug, an EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor and a photosensitizing agent. It is a member of carbazoles and an organochlorine compound.