China Nucleic acids and their salts (HS 293499) Exports by Country

Cyclic sulfonic acid esters and their nitrogen analogs, characterized by sulfur and oxygen or nitrogen atoms within a heterocyclic ring structure.

A specific nitrofuran antibacterial compound containing a fused furazan and oxazolidinone ring system, alongside its chemical salts.

Biological polymers and their salts, including DNA and RNA, whether chemically defined or not, distinct from the synthetic heterocyclic derivatives in this group.

Specific antiretroviral agents—nevirapine, efavirenz, and ritonavir—and their salts are classified here as distinct heterocyclic compounds with mixed hetero-atoms.

A beta-lactamase inhibitor derived from streptomyces bacteria, utilized to potentiate penicillin antibiotics, and its corresponding salts.

Cephalosporin antibiotic synthesis intermediates, including 7-aminocephalosporanic and 7-aminodeacetoxycephalosporanic acids, and a specific chloromethyl cephem ester.

Chemical intermediates built around a fused thiazolidine and beta-lactam ring system, serving as the core nucleus for synthesizing various penicillin-class antibiotics.

Heterocyclic compounds featuring mixed hetero-atoms that fall outside the specifically enumerated structural exclusions and named chemical intermediates of this heading.