Novel positive allosteric modulator of GABAB receptor function. Potentiates the effects of GABA on [35S]GTPγS binding at recombinant and native GABAB receptors (EC50 values are 2.1 and 3.1μM respectively). Decreases cocaine self-administration, blocks the rewarding properties of nicotine and produces anxiolytic-like activity without the side effects associated with baclofen or benzodiazepines.