Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds
Heterocyclic compounds containing an unfused thiazole ring, whether or not hydrogenated, in the structure
Heterocyclic compounds containing in the structure a benzothiazole ringsystem, whether or not hydrogenated, but not further fused (excl. inorganic or organic compounds of mercury)
Heterocyclic compounds containing in the structure a phenothiazine ringsystem, whether or not hydrogenated, but not further fused