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<p>exert strong effects on noradrenaline systems in the brain, resulting in effects that may be helpful or harmful.</p>

<p><big>Structure</big></p>
<p>Norepinephrine is a <a href="page.php?w=catecholamine">catecholamine</a> and a <a href="page.php?w=substituted_phenethylamine">phenethylamine</a>. Its structure differs from that of <a href="page.php?w=epinephrine">epinephrine</a> only in that epinephrine has a <a href="page.php?w=methyl_group">methyl group</a> attached to its nitrogen, whereas the methyl group is replaced by a hydrogen atom in norepinephrine.</p><p>
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