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adj. homocyclic

Containing a ring of atoms of one element, especially a ring composed exclusively of carbon atoms. It is practically identical in meaning with carbocyclic (which see).

adj. containing a closed ring of atoms of the same kind especially carbon atoms

"For the analysis of DPOR substrate recognition, 11 synthetic derivatives with altered substituents on the four pyrrole rings and the isocyclic ring plus eight chlorophyll biosynthetic intermediates were tested as DPOR substrates."

cyclic