Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds

293410 Heterocyclic compounds; containing an unfused thiazole ring (whether or not hydrogenated) in the structure 293420 Heterocyclic compounds; containing in the structure, a benzothiazole ring-system (whether or not hydrogenated), not further fused 293430 Heterocyclic compounds; containing in the structure, a phenothiazine ring-system (whether or not hydrogenated), not further fused 293491 Heterocyclic compounds; other heterocyclic compounds, n.e.c. in 2934.1, 2934.2 and 2934.3 293492 Heterocyclic compounds; other fentanyls n.e.c. in 2934, and their derivatives 293499 Nucleic acids and their salts, other heterocyclic compounds, n.e.c. in heading number 2934