We don't have synonyms for piperazin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are piperin and piperazine.
(n) :
Alternative form of piperazine. [(organic chemistry, pharmacology, uncountable) A saturated heterocyclic compound, C₄H₁₀N₂, containing two nitrogen atoms in a six-membered ring; it is used as an anthelmintic.]
(n) :
Alternative form of piperazine. [(organic chemistry, pharmacology, uncountable) A saturated heterocyclic compound, C₄H₁₀N₂, containing two nitrogen atoms in a six-membered ring; it is used as an anthelmintic.]