Side chain
oligomeric or polymeric chemical group that is attached to a core part of the molecule called "main chain" or backbone
A side chain in organic chemistry is a chemical group. It is attached to the molecule's "main chain" or backbone. A side chain is also known as a pendant chain.
Alkyl (saturated hydrocarbon) group side chains are represented by the placeholder R. Other non-carbon groups can be represented by X, Y, or Z.