Human beta(3) adrenergic receptor agonists containing 5-membered ring ureas
were shown to be potent partial agonists with excellent selectivity over b
eta(1) and beta(2) binding. L-760,087 (4a) and L-764,646 (5a) (beta(3) EC50
= 18 and 14 nM, respectively) stimulate lipolysis in rhesus monkeys (ED50
= 0.2 and 0.1 mg/kg, respectively) with minimal effects on heart rate. Oral
absorption in dogs is improved over other urea analogs. (C) 1999 Elsevier
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