SCH 50911 is (+)-(S)-5,5-dimethylmorpholinyl-2-acetic acid and is a selective, orally-active and competitive γ-Aminobutyric acid B GABA(B) receptor antagonist, binds to GABA(B) receptor (IC50: 1.1 μM). SCH 50911 antagonizes GABA(B) autoreceptors, increasi