You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(6,8-dichloroimidazo[1,2-a]pyridin-2-yl)ethyl]-2-(3-ethylphenoxy)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19Cl2N3O2
assistant