sentence: Drugs used were : morphine hydrochloride ( Fauldings , Adelaide , South Australia ) ; β - casomorphin [ 1 – 4 ] amide ( morphiceptin ) , [ D-Ala , D-Leu ] - enkephalin ( DADLE ) , [ D-Ala , N-Me-Phe , Gly-ol ] - enkephalin ( DAMGO ) , dynorphin A , ibuprofen , naloxone hydrochloride , Poly R-478 , and other chemicals from Sigma-Aldrich Chemical Company ( Sydney , Australia ) ; met-enkephalin and custom synthesis of casoxin 4 and lactoferroxin A from Auspep ( Melbourne , Victoria , Australia ) .