You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[[6-amino-1-(2-methylpropyl)-2,4-dioxopyrimidin-5-yl]-(2-methoxyethyl)amino]-2-oxoethyl] 5-chloro-2-methoxybenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27ClN4O7
assistant