2933.37.00.00 - N-Phenethyl-4-piperidone (NPP)

This HTS classification, 2933.37.00.00, specifically covers N-Phenethyl-4-piperidone, commonly known as NPP. NPP is an organic chemical compound characterized by a piperidone ring substituted with a phenethyl group. It falls under the broader category of heterocyclic compounds containing nitrogen, and more specifically, within compounds featuring an unfused pyridine ring in their structure. This particular code is designated for NPP as a distinct chemical entity for import and export purposes.

Distinguishing this classification from its siblings, it's important to note that while other entries in this chapter cover pyridine and its salts (2933.31.00.00) or piperidine and its salts (2933.32), and a broad array of specific pharmaceuticals like Alfentanil and Fentanyl derivatives (2933.33 and 2933.34), 2933.37.00.00 is reserved solely for NPP. This code does not encompass simpler piperidine or pyridine structures, nor does it include the highly regulated fentanyl analogues and their direct derivatives, differentiating it by its specific chemical structure and intended classification.

As a leaf node, 2933.37.00.00 has no further subcategories. Therefore, classification within this code is definitive for NPP itself. Importers and exporters should ensure that the substance being declared precisely matches the chemical identity of N-Phenethyl-4-piperidone to ensure correct customs processing and compliance. Its unique designation reflects its specific chemical properties and often its role as a precursor or intermediate in various chemical syntheses.