Subheading 2933.59 · Section VI
Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, (other than malonylurea and its derivatives, loprazolam, mecloqualone, methaqualone, zipeprol, and salts thereof) n.e.c. in 2933.5
Source: Harmonized System 2022 edition (World Customs Organization), from the UN Comtrade classification list.