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Heterocyclic Compounds with 4 or More Rings: A class of organic compounds containing four or more ring structures, one of which is made up of more than one kind of atom, usually carbon plus another atom. The heterocycle may be either aromatic or nonaromatic.
Source: MeSH 2007
The following list attempts to classify Heterocyclic Compounds with 4 or More Rings into categories where each line is subset of the next.
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