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 tert-butyl N-[[6-(1,1-difluoro-2-phenylethyl)-5-fluoro-2-methoxypyridin-3-yl]methyl]-N-methylcarbamate .
user
C21H25F3N2O3
assistant