Riboflavin Tetrabutyrate from Mexico
Lipophilic ester derivative of Riboflavin for specialized vitamin delivery systems. HTS 2936.23.00.00 applies as a derivative used primarily as Vitamin B2, following Chapter 29 rules for ester classification with parent compound.
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.860%Universal product exemption (U.S. note 52(b))
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Validate molecular structure documentation; test for solvent residues per Chapter note (e); partner with customs broker experienced in novel vitamin esters