two substance p ( sp ) analogues , [ d-pro2 , d-phe7 , d-trp9 ] -sp ( dpdpdt ) and [ d-trp7,9 ] -sp ( dt79 ) , previously described as tachykinin antagonists , have been shown to contract the rat colon muscularis mucosae preparation .
C0038585
sp
C0039241
tachykinin