the opioid peptides , 3-h-d-ala2 , d-leu5-enkephalin , 3h-d-ser2 , leu5 , thr6-enkephalin , 3h-d-ala2 , met5-enkephalin amide , and 3h-d-ala2 , n-mephe4 , gly-ol5-enkephalin , as well as the benzomorphan , 3h-bremazocine , apparently lack the structural characteristics which allow photolabeling .
C0205753
opioid peptides
C0014298
enkephalin