Diethyl L-tartrate from Mexico
Diethyl L-tartrate contains a five-membered lactone-like structure in tartaric acid derivatives with oxygen heteroatoms, classified under HTS 2932.20.50 per ester rules. Used as chiral auxiliary in asymmetric synthesis.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Enantiomeric excess (>99% ee) certification mandatory for research grade
• Light-sensitive; amber glass bottles required for stability
• Avoid 'catalyst' declaration which may trigger different documentation