Selective, non-peptide CRF 1 receptor antagonist (K i values are 2.7 and > 10000 nM for CRF 1 and CRF 2 receptors respectively). Blocks CRF-induced adenylate cyclase activation (K i = 3.7 nM) and attenuates activation of the HPA axis by CRF. Displays anxiolytic-like activity in the rat elevated plus-maze test; brain penetrant.