HSN Code 2920 refers to "Esters of other inorganic acids of non-metals and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives (excluding esters of hydrogen halides and of phosphoric esters, their salts and their halogenated, sulphonated, nitrated or nitrosated derivatives)." This classification code is essential for identifying chemical compounds for import/export purposes based on their nature, composition, and intended use. Common products under HSN Code 2920 include various esters, salts of inorganic acids, and their derivatives. Additionally, the GST rate for these chemical compounds under this code supports accurate trade compliance.