FG-5893 is a chemical from the diphenylbutylpiperazine class of agents. It is a 5-HT1A agonist and a 5-HT2A antagonist.
It is believed to be an anxiolytic agent with potential uses in the treatment of substance abuse disorders particularly alcoholism.
There is evidence for FG-5893 behaving as a SNDRI:
CNS review: