The luteinizing hormone (LH) receptor plays an important role in fertility and certain cancers. The endogenous ligands human chorionic gonadotropin (hCG) and LH bind to the large N terminal domain of the receptor. We recently reported on the first radiolabeled low molecular weight (LMW) agonist for this receptor,[3H] Org 43553, which was now used to screen for new LMW ligands. We identified a terphenyl derivative that inhibited [3H] Org 43553 ...