211031 Lactones n.e.c., heterocyclic compounds with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring, a pyrimidine ring, a piperazine ring, an unfused triazine ring or a phenothiazine ring system not further fused/ hydantoin and its derivatives

21103110 Lactones (excluding coumarin, methylcoumarins and ethylcoumarins) 21103130 Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure 21103140 Hydantoin and its derivatives 21103155 Malonylurea (barbituric acid) and its derivatives, and salts thereof 21103159 Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure (excluding malonylurea (barbituric acid) and its derivatives) 21103170 Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure (excluding melamine) 21103180 Compounds containing a phenothiazine ring-system (whether or not hydrogenated)/ not further fused