(1,2,5,6-Tetrahydropyridin-4-yl)methylphosphinic acid

(1,2,5,6-Tetrahydropyridin-4-yl)methylphosphinic acid (TPMPA) is a GABA antagonist selective for the GABA$A$-ρ (previously known as GABA$C$) subtype.