You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-5-[3-[[3-chloro-4-(2,2-dimethylpropoxy)pyridin-2-yl]oxymethyl]cyclobutyl]oxy-4-methylpentan-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32ClNO4
assistant