Ursodeoxycholic acid (UDCA, CAS: 128-13-2) is a hydrophilic bile acid with the chemical formula C₂₄H₄₀O₄ and molecular weight 392.572 g/mol. As the primary active component of bear bile (1-3% of bile acid pool), it is FDA-approved for treating primary biliary cholangitis (PBC) (brand name: Urso®). The 2023 EASL guidelines designate it as first-line therapy for PBC (Evidence Level: 1A), while China's PBC Diagnosis and Treatment Guidelines (2023) recommend a dosage of 13-15 mg/kg/d.

Product Name: Ursodeoxycholic acid

CAS No.​: 128-13-2

Molecular Formula: C₂₄H₄₀O₄