201452 Heterocyclic compounds n.e.c./ nucleic acids and their salts

20145210 Heterocyclic compounds with oxygen only hetero-atom(s) (including coumarin/ methylcoumarins and ethylcoumarins) (excluding other lactones) 20145230 Heterocyclic compounds with nitrogen only hetero-atom(s)/ containing an unfused imidazole ring (excluding hydantoin and its derivatives) 20145260 Melamine 20145280 Compounds containing in the structure an unfused pyridine ring or a quinoline or isoquinoline ring-system, not further fused/ lactames/ other heterocyclic compounds with nitrogen hetero-atom(s) only (excluding compounds containing in the structure an unfused pyrazole ring, an unfused imidazole ring, a pyrimidine ring, a piperazine ring or an unfused triazine ring) 20145290 Nucleic acids and other heterocyclic compounds - thiazole, benzothiazole, other cycles