( - ) -n-n-propylnorapomorphine ( ( - ) -npa ) , a dopamine agonist , and 5'-guanylyl imidodiphosphate ( gpp ( nh ) p ) , a nonhydrolyzable gtp analog , caused a dose-dependent inhibition of adenylate cyclase in control tissue .
C0018366
gpp ( nh ) p
C0018353
gtp