4-(2-(6-(2-(2-(2-fluoroethoxy)ethoxy)ethoxy)pyridin-3-yl)vinyl)-N-methylbenzamide [ 18F-AV-45,2-(2-(2-(2-fluoroethoxy)ethoxy)ethoxy)-5-(4-methylaminostyryl)pyridine,AV-45 compound,florbetapir,florbetapir F18 ] a PET agent for Abeta plaques; structure in first source