The GABA receptors (GABA_A and GABA_B) respond to the neurotransmitter gamma-aminobutyric acid (GABA), the chief inhibitory compound in the mature vertebrate central nervous system. GABA receptors agonists produce typically sedative effects, and may also cause other effects such as anticonvulsant, anxiolytic and muscle relaxant effects. Antagonists of GABA receptors inhibit the action of GABA. In general they produce stimulant and convulsant effects. Therefore, small molecule compounds modulating GABA receptors activity may have significant therapeutic potential.

Selective estrogen receptor modulators (SERMs) are compounds that act on the estrogen receptors (ERs). A characteristic that distinguishes these substances from pure ER antagonists and agonists (silent antagonists and full agonists) is that their action is different in various tissues, thereby granting the possibility to selectively inhibit or stimulate estrogen-like action in various tissues.