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