Prostaglandin D2 (PGD2) from Canada
Prostaglandin D2 (PGD2), a natural prostanoid mediator of allergic responses, used in research. Falls under HTS 2937.50.00.00 as naturally occurring prostaglandin reproduced by synthesis. Chemically defined for Chapter 29 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
• Research chemical requires end-use statement distinguishing from clinical material
• Natural product reproduced by synthesis qualifies per heading description
• Document D-ring ketone distinguishing from other prostaglandins