configurational base unit 

in polymers
https://doi.org/10.1351/goldbook.C01250
A constitutional repeating unit in a regular macromolecule, a regular oligomer molecule, regular block or a regular chain, the configuration of which is defined at least at one site of stereoisomerism in the main chain (backbone).
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2291 [Terms] [Paper]
Citation: 'configurational base unit' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.C01250 RIS BibTex EndNote
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Last revised: February 24, 2014