configurational base unit

in polymers
https://doi.org/10.1351/goldbook.C01250
A @C01286@ in a @R05247@, a @R05248@, @R05244@ or a regular @C00946@, the configuration of which is defined at least at one site of @S05983@ in the @M03694@.
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2291 [Terms] [Paper]