Final answer:
Heparin is the compound that inhibits adherence of platelets to endothelial cells.
Step-by-step explanation:
The compound that inhibits adherence of platelets to endothelial cells lining blood vessel walls is heparin. Heparin is a short-acting anticoagulant that is found in both mast cells and on the surfaces of cells lining the blood vessels. It opposes the conversion of prothrombin to thrombin and helps to maintain a normal, clot-free condition of blood.