2933.21.00.00 - Hydantoin and its derivatives

This classification, HTS Code 2933.21.00.00, specifically covers hydantoin and its derivatives. Hydantoin is a heterocyclic organic compound characterized by a five-membered ring structure containing two nitrogen atoms and two carbonyl groups. Derivatives encompassed here are compounds that are chemically modified forms of hydantoin, retaining its core hydantoin ring structure, and are typically used as intermediates in the synthesis of pharmaceuticals, agrochemicals, and other specialty chemicals.

This heading is distinct from its sibling, 2933.29 ("Other"), by its specificity. While 2933.29 would encompass other compounds containing an unfused imidazole ring that are not hydantoin or its direct derivatives, 2933.21.00.00 is exclusively for the hydantoin chemical structure and its related compounds. The presence of the characteristic hydantoin ring is the defining feature for classification under this code.

As this is a leaf node, there are no further subcategories. Classification decisions within 2933.21.00.00 will therefore rely on confirming the chemical structure as hydantoin or a direct derivative thereof, and potentially considering its specific use or modification if any are explicitly outlined in the broader scope of Chapter 29.