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
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
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