furan, , pyrrol, , thiofen, , thiazol, , isochinolin, , prolin, , oxazol, , akridin, , indol, , pyridin, , pirimidin, , kys nikotinova, , imidiazol, , kys barbiturova, , uracil, , thymin, , purin, , kys mocova, , adenin, , xanthin.

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