You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 1-[2-chloro-2-(4-chlorophenyl)acetyl]oxy-4-[(2-methylpropan-2-yl)oxy]cyclohexane-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28Cl2O5
assistant