(chain) conformational repeating unit
of a polymer
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https://doi.org/10.1351/goldbook.C00950
The smallest structural unit of a polymer chain with a given conformation that is repeated along that chain through symmetry operations.
Source:
Purple Book, 1
st
ed., p. 77 (http://old.iupac.org/publications/books/author/metanomski.html)