2-([1,1'-Biphenyl]-2-yl)acetic acid, known as felbinac, is a non-steroidal anti-inflammatory drug (NSAID) used topically for pain relief and reducing inflammation in conditions such as arthritis and sports injuries. It inhibits cyclooxygenase (COX) enzymes to decrease prostaglandin production. As a key pharmaceutical compound, its biphenyl structure provides lipophilicity, aiding skin penetration in topical formulations. It also serves as a building block or intermediate in synthesizing other organic molecules with potential therapeutic applications in research settings.