<prompt> Drugs acting through receptors exhibit the following features exceptStructural specificityHigh potencyCompetitive antagonismDependence of action on lipophilicity  <response>: A drug acting on a specific receptor must have a specific structure, high affinity and potency can be a agonist or an antagonist. Lipophilicity is not a feature for a drug to bind to receptor. Ref: KDT 6 e pg 45 