You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-methoxyphenoxy)-1-[4-(pyrazolo[1,5-a]pyridin-2-ylmethyl)piperazin-1-yl]ethanone .
user
C21H24N4O3
assistant