Cis-fused

{
  "id": "MLC-T-CHM-002090",
  "term": "Cis-fused",
  "field": "Chemistry",
  "definition": "A stereodescriptor for two rings sharing a bond, meaning that the exocyclic atoms or groups on the two shared bridgehead atoms lie on the same side of the ring system. In cis-decalin the two ring-fusion hydrogens are on the same face, whereas in trans-decalin they are on opposite faces. The descriptor is placed before the ring-system name and applies to saturated bridgeheads.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "cis, trans",
    "bridge"
  ],
  "references": [
    "Blue Book, p. 479 (https://www.acdlabs.com/iupac/nomenclature/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/cis-fused/"
}