You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[(6-chloroimidazo[1,2-a]pyridin-2-yl)methyl]piperazin-1-yl]-N,N-diethylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H26ClN5O
assistant