D-Erythronolactone from Mexico
D-Erythronolactone is a four-carbon sugar lactone with five-membered oxygen ring, under HTS 2932.20.50.50. Used in carbohydrate chemistry and as chiral building block.
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
• Optical rotation specification confirms D-isomer vs L-isomer classification
• Research chemical exemption may apply; include institutional end-user certificates
• HPLC purity certificate prevents mixture classification issues