2918.22.10.00 - O-Acetylsalicylic acid (Aspirin)

This HTS subheading specifically classifies O-Acetylsalicylic acid, commonly known as Aspirin, in its pure acid form. This entry is for the raw chemical compound itself, not for formulated pharmaceutical products or preparations. The classification is based on the chemical structure, identifying it as a carboxylic acid with a phenol function, further modified by an acetyl group.

It is crucial to distinguish this subheading from its sibling category, 2918.22.50.00, which covers the salts and esters derived from O-Acetylsalicylic acid. While closely related, this subheading strictly pertains to the acidic form. Therefore, any compound where the carboxylic acid group has reacted to form a salt or an ester would fall under the sibling category and not this specific code.

As this subheading represents a leaf node within the HTS structure, there are no further subdivisions. Classification under 2918.22.10.00 is definitive for O-Acetylsalicylic acid itself. Importers and exporters should ensure that the goods presented for classification are precisely this chemical compound and not its derivatives or any pre-formulated medicinal products.