The synthesis and pharmacological activity of new nonpeptide angiotensinII (AII) receptorantagonists are presented. These 5-O-substituted and 5-C-substituted 3-alkylpyrazole derivatives represent a new series of antagonists and have led to the discovery of compounds with potent oral antihypertensive activity in a renal artery-ligated rat model. In vitro, they displayed a high affinity for rat adrenal