Preferred constitutional repeating unit

{
  "id": "MLC-T-CHM-009380",
  "term": "Preferred constitutional repeating unit",
  "field": "Chemistry",
  "definition": "The specific constitutional repeating unit (CRU) chosen by applying a defined set of IUPAC seniority rules for naming a regular single-strand polymer. When multiple valid CRUs exist for a polymer structure, these rules dictate a unique choice based on factors like the presence of heterocyclic rings, specific atoms in the main chain, and the complexity of substituents. This systematic selection provides a single, unambiguous name for the polymer.",
  "subject": "Polymer",
  "references": [
    "PAC, 2021, 93, 963. 'Structure-based nomenclature for irregular linear, star, comb, and brush polymers (IUPAC Recommendations 2020)' on page 966 (https://doi.org/10.1515/pac-2020-0103)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/preferred-constitutional-repeating-unit/"
}