You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-tert-butyl-N-(2-formamidoethyl)-4-(furan-2-ylmethylamino)-N-(2-methylpropyl)pyrimidine-5-carboxamide is given. What is its corresponding molecular formula?
user
C21H31N5O3
assistant