_:b663967014 . _:b663967014 . _:b663967014 . _:b663967014 "dexmedetomidine hydrochloride (CHEBI:31472) is enantiomer of levomedetomidine hydrochloride (CHEBI:48557) because the stereochemistry of the central chiral carbon is swapped." . _:b663967014 . _:b663967014 . _:b663967014 . _:b663967014 .