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pyridine
piperidine
chinoline
isochinoline
pyrimidine
pyrazine
1,3,5-triazine
pyrrool
pyrrolidine
imidazool
pyrazool
indool
benzimidazool
purine
furaan
thiofeen
oxazool
2-oxazoline
isoxazool
thiazool
2-thiazoline
azepaan
morfoline