You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-(diethylamino)-2-oxoethyl]-N-[3-(2-methylpropoxy)propyl]-1,4-diazepane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H38N4O3
assistant