Unoprostone Isopropyl from Canada
Unoprostone isopropyl, a docosanoid prostaglandin F2α isomer, treats glaucoma. Classified under HTS 2937.50.00.00 as prostaglandin ester structural analogue per Chapter 29 ester rules. Longer chain maintains hormonal classification.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals: 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
• Document 22-carbon chain distinguishing from C20 prostaglandins
• Isopropyl ester follows parent acid classification per Chapter Note
• Primarily Japanese market; ensure ICH Q1A stability equivalence