Used as an intermediate in the synthesis of azo dyes and pigments, particularly for producing colorants with good light and wash fastness. In the pharmaceutical industry, it is primarily known as sodium mesalazine (5-aminosalicylic acid sodium salt) and used directly as an anti-inflammatory agent for treating inflammatory bowel diseases such as ulcerative colitis and Crohn's disease, rather than solely for preparing other agents. It may also contribute to the synthesis of certain analgesic compounds. Additionally, it serves as a building block in organic synthesis where both amino and hydroxyl functionalities are needed for further chemical modifications.