The qualifying compounds are defined by Subheading Note 2 to Chapter 30 of the HTS, which lists specific antimalarial substances such as chloroquine, hydroxychloroquine, artemisinin derivatives, and related compounds. Importers should consult the current text of that note — not informal lists — to confirm whether their specific active ingredient qualifies, as the note's scope controls classification and cannot be inferred from the drug's therapeutic use alone.

Heading 3003 covers medicaments not put up in measured doses or in forms or packings for retail sale; heading 3004 covers the same types of medicaments once they are in measured doses or retail packaging. An antimalarial bulk API or intermediate shipped in drums or bulk containers belongs in 3003600000, while the same compound packaged in blister packs or unit-dose tablets for retail sale would move to the corresponding 3004 subheading. The physical form and packaging at the time of importation — not the intended downstream use — determines the correct heading.