Senior constitutional repeating unit

{
  "id": "MLC-T-CHM-010740",
  "term": "Senior constitutional repeating unit",
  "field": "Chemistry",
  "definition": "The constitutional repeating unit chosen from two or more alternatives according to a hierarchical set of IUPAC nomenclature rules. When naming an irregular polymer, the units are ranked based on criteria such as the presence of heterocycles, heteroatoms in the main chain, and the complexity of substituents. The unit with the highest seniority is cited first in the polymer's name, providing a consistent basis for structural representation.",
  "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/senior-constitutional-repeating-unit/"
}