the corresponding guanidine 52 ( arpromidine , n1- [ 3- ( 4-fluorophenyl ) -3-pyridin-2-ylpropyl ] -n2- [ 3- ( 1h-imidazol-4- yl ) propyl ] guanidine ) combines about 100 times the activity of histamine at the h2 receptor with h1-antagonistic potency in the range of pheniramine .
C2757048
receptor
C0031408
pheniramine