title: S-15535
text: # S-15535
  
  S-15535 is a phenylpiperazine drug which is a potent and highly selective $5-HT_{1A}$ receptor ligand that acts as an agonist and antagonist (weak partial agonist) at the presynaptic and postsynaptic $5-HT_{1A}$ receptors, respectively. It has anxiolytic properties.
  
  