Ring-sector

{
  "id": "MLC-T-CHM-013511",
  "term": "Ring-sector",
  "field": "Chemistry",
  "definition": "An unbranched chain of ring atoms that runs between two bridgeheads or ring junctions, used in naming bridged and fused polycyclic systems, without containing any other bridgehead or junction. A bond joining two bridgeheads directly is called a bond ring-sector and carries no atoms. Norbornane has three ring-sectors, of two, two and one atoms, linking its two bridgehead carbons.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "bridge",
    "sequence"
  ],
  "references": [
    "Blue Book, p. 499 (https://www.acdlabs.com/iupac/nomenclature/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/ring-sector/"
}