the rank order of potency of the peptides was beta-endorphin ( ic50 = 97 nmol/l ) approximately equal to bam-22p greater than fk-33824 greater than dago greater than [ d-ala2 , d-leu5 ] -enkephalin greater than or equal to metorphamide greater than dynorphin a- ( 1-13 ) approximately equal to [ met5 ] enkephalin .
C0525773
dago
C0014298
enkephalin