Phenylephrine, an organic substance with molecular formula C9H13NO2, is used as a nasal decongenstant in over-the-counter medications. The molecular structure of phenylephrine is shown below using the usual shortcut organic nomenclature.
One of the active ingredients in Alka-Seltzer PLUS cold medication is "phenylephrine hydrochloride." How does this ingredient differ from the structure shown below?
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