Phthalide from Mexico
Phthalide is a bicyclic aromatic lactone consisting of a benzene ring fused to a five-membered γ-lactone ring, falling under HTS 2932.20.4500 as an aromatic lactone. It serves as an intermediate in pharmaceutical synthesis and dye production.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Submit NMR or mass spectrometry data verifying the fused aromatic lactone structure for proper Chapter 29 classification
• Declare intended use as chemical intermediate only; avoid consumer packaging that suggests retail sale
• Ensure stabilizer additions qualify under Chapter note (f) for preservation without changing classification