in the present study , the b2 antagonist analogues of bradykinin ( bk ) and kallidin ( kd ) : [ ( thi6,9 , d-phe8 ] kd , [ thi5,8 , d-phe7 ] bk ) were also found to be potent releasers of histamine from rat mast cells and not to exert any antagonistic effect .
C0022474
kd
C0006100
bk