01250 IUPAC Gold Book - configurational base unit 10.1351/goldbook.C01250 C01250 current 1 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. chain https://goldbook.iupac.org//terms/view/C00946 constitutional repeating unit https://goldbook.iupac.org//terms/view/C01286 main chain https://goldbook.iupac.org//terms/view/M03694 regular block https://goldbook.iupac.org//terms/view/R05244 regular macromolecule https://goldbook.iupac.org//terms/view/R05247 regular oligomer molecule https://goldbook.iupac.org//terms/view/R05248 stereoisomerism https://goldbook.iupac.org//terms/view/S05983 PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2291 (https://doi.org/10.1351/pac199668122287) https://goldbook.iupac.org/terms/view/C01250/html https://goldbook.iupac.org/terms/view/C01250/json https://goldbook.iupac.org/terms/view/C01250/plain 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. 10.1351/goldbook.C01250 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-21T02:54:23+00:00