2933.99.58.00 - Droperidol; and Imipramine hydrochloride

This HTS category, 2933.99.58.00, specifically covers the pharmaceutical substances Droperidol and Imipramine hydrochloride. Droperidol is a butyrophenone antipsychotic and antiemetic, while Imipramine hydrochloride is a tricyclic antidepressant. Both are complex heterocyclic organic compounds containing nitrogen, falling under the broader classification of drugs primarily affecting the central nervous system and used as antidepressants, tranquilizers, or other psychotherapeutic agents.

This classification is distinct from its sibling category, 2933.99.61.00, which encompasses "Other" heterocyclic compounds with nitrogen hetero-atoms only, not specifically designated as Droperidol or Imipramine hydrochloride. Therefore, the presence of these two specific named compounds is the defining characteristic for classification under 2933.99.58.00.

As a leaf node, this category does not have further subcategories. Classification into this code is determined by the precise chemical identity of the imported or exported substance, confirming it is either Droperidol or Imipramine hydrochloride. Customs officials will rely on chemical analysis, product documentation, and specific declarations to ensure correct application of this code.