two o-glucopeptides , h-tyr ( beta-d-glc ) -gly-gly-phe-oh ( 10 ) and h-tyr ( beta-d-glc ) -gly-gly-phe-leu-oh ( 11 ) , having the amino acid sequence of enkephalin , were synthesized to determine the influence of the carbohydrate molecule on the biological activity and conformation of these opioid peptides .
C0014298
enkephalin
C0205753
opioid peptides