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Heterocyclic Compounds, 4 or More Rings

"Heterocyclic Compounds, 4 or More Rings" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.

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A class of heterocyclic compounds that include four or more fused rings. Both aromatic or non-aromatic ring structures are included in this category.

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