A potent, selective, non-peptide, orally active neurokinin NK2 receptor antagonist. Competes for binding of [3H]GR100679 to hNK2-transfected CHO cells with a pKi of 9.5. Inhibits NK2 receptor-mediated contraction of guinea pig trachea with a pA2 of 8.7. Anxiolytic in vivo.