title: SB-204741
text: # SB-204741
  
  SB-204741 is a drug which acts as a potent and selective antagonist at the serotonin $5-HT_{2B}$ receptor, with around 135x selectivity over the closely related $5-HT_{2C}$ receptor, and even higher over the $5-HT_{2A}$ receptor and other targets. It is used in scientific research for investigating the functions of the $5-HT_{2B}$ receptor.
  
  