A piperazine derivative is disclosed of formula : ##STR1## and the non toxic addition salts thereof, along with a process for preparation, pharmaceutical composition, and method of treating {HEAD ~ conditions} characterized by {TAIL ~ histamine activity} 
characterized by
A piperazine derivative is disclosed of formula : # # STR1 # # and the non toxic addition salts thereof , along with a process for preparation , pharmaceutical composition , and method of treating { HEAD ~ conditions } characterized by { TAIL ~ histamine activity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL