You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2S)-2-[(4-chloro-3-methylphenoxy)methyl]-4-(6-methoxypyridine-2-carbonyl)morpholin-2-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24ClN3O5
assistant