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Additional
substituent
English Wikipedia - The Free Encyclopedia
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Substituent
In
organic chemistry
and
biochemistry
, a
substituent
is an
atom
or group of atoms substituted in place of a
hydrogen
atom on the
parent chain
of a
hydrocarbon
, becoming a
moiety
of the resultant new
molecule
. The terms
substituent
,
side chain
,
group
,
branch
, or
pendant group
are used almost interchangeably to describe branches from a parent structure, though certain distinctions are made in the context of
polymer
chemistry. In
polymers
, side chains extend from a backbone structure. In
proteins
, side chains are attached to the
alpha carbon
atoms of the
amino acid
backbone.
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