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