RS-56812 is a potent and selective

partial agonist In pharmacology, partial agonists are drugs that bind to and activate a given receptor, but have only partial efficacy at the receptor relative to a full agonist. They may also be considered ligands which display both agonistic and antagonis ...

at the 5HT₃ receptor. It has been shown to improve performance on animal tests of memory. Its use in humans is not well documented.

References

Serotonin receptor agonists Tryptamines Acetamides Quinuclidines 5-HT3 agonists {{nervous-system-drug-stub