heterocyclic compound(redirected from Heterocyclic compounds with 4 or more rings)
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heterocyclic compound[‚hed·ə·rō′sī·klik ¦käm‚pau̇nd]
Compound in which the ring structure is a combination of more than one kind of atom; for example, pyridine, C5H5N.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.