You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N,N-diethyl-2-[(4S)-4-(1H-indol-3-ylmethyl)-2,5-dioxoimidazolidin-1-yl]acetamide is given. What is its corresponding molecular formula?
user
C18H22N4O3
assistant