p-Aminosalicylic Acid (PAS) from Canada
p-Aminosalicylic acid features amino and single phenolic hydroxy with additional carboxylic acid, but classifies as oxygen-function amino-compound under 2922.29 'other'. Used as anti-tuberculosis pharmaceutical intermediate. Single phenolic oxygen function distinguishes it.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
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
• Include FDA import alert check; pharma intermediates require drug master file references despite bulk chemical status
• Test for optical purity if chiral; racemic mixtures stay in 2922 but enantiopure may face 2941 scrutiny
• Avoid emetic additives unless solely for safety ID (note g); pharma use could reclassify