_:b666498472 . _:b666498472 . _:b666498472 "dexmedetomidine hydrochloride (CHEBI:31472) is enantiomer of levomedetomidine hydrochloride (CHEBI:48557) because the stereochemistry of the central chiral carbon is swapped." . _:b666498472 . _:b666498472 . _:b666498472 . _:b666498472 . _:b666498472 .