A cyclic structure containing at least two different elements (e.g., carbon and nitrogen) in the ring.
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(2',3',5'-tri-O-benzyl-β-D-ribofuranosyl)methylurea
4-amino-7-[3-bromo-5-O-(tert-butyldiphenylsilyl)-3-deoxy-β-D-xylofuranosyl]pyrrolo[2,3-d]pyrimidine
