Subheading 293410: Heterocyclic Compounds; Containing an Unfused Thiazole Ring ( … etc.
Subheading 293420: Heterocyclic Compounds; Containing in the Structure, a Benzot … etc.
Subheading 293430: Heterocyclic Compounds; Containing in the Structure, a Phenot … etc.
Subheading 293491: Heterocyclic Compounds; other Heterocyclic Compounds, N.E.C. … etc.
Subheading 293492: Heterocyclic Compounds; other Fentanyls N.E.C. in 2934, and t … etc.
Subheading 293499: Nucleic Acids and their Salts, other Heterocyclic Compounds, … etc.