NPP Stabilized with Antioxidant from Japan
N-Phenethyl-4-piperidone (NPP) with added BHT stabilizer to prevent oxidation during storage and transport, as permitted under Chapter 29 note 2(f). Retains chemical identity as heterocyclic nitrogen compound of 2933.37.00.00. Used in synthesis of opioid receptor compounds and research chemicals.
Duty Rate — Japan → United States
21%
Rate breakdown
9903.04.628.5%Patented pharmaceutical articles that are the product of Japan, of a European Union member country, of South Korea, of Switzerland, or of Liechtenstein as provided for in subdivisions (c) and (f) of U.S. note 40 to this subchapter
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include stabilizer composition (<1% by weight) in SDS; must prove addition solely for preservation per note 2(f)
• Maintain cold chain logistics (2-8°C) as specified; temperature logs prevent degradation claims
• Cross-check stabilizer doesn't create 'specific use' formulation disqualifying Chapter 29 classification