2-Chloro-5-hydroxyisonicotinic acid, also known as CHINA, is a versatile and important compound in chemical synthesis. It serves as a key building block in the production of pharmaceuticals, agrochemicals, and functional materials due to its unique structural properties. In chemical synthesis, 2-Chloro-5-hydroxyisonicotinic acid is valued for its ability to undergo various reactions, including esterification, amidation, and nucleophilic substitution. These reactions enable the synthesis of complex molecules with specific functions and properties. The presence of both a chloro and hydroxy functional group in its structure provides opportunities for selective modifications, allowing chemists to tailor the compound for specific applications. 2-Chloro-5-hydroxyisonicotinic acid is particularly useful in the synthesis of biologically active compounds, such as antiviral drugs, anti-tumor agents, and herbicides, making it a valuable tool in medicinal and agricultural chemistry. Furthermore, its compatibility with a wide range of reaction conditions and its relatively low cost make 2-Chloro-5-hydroxyisonicotinic acid a popular choice for researchers and industry professionals alike seeking to synthesize novel compounds with high efficiency and efficacy.