You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[(4S)-4-(1H-indol-3-ylmethyl)-2,5-dioxoimidazolidin-1-yl]-N-[(1S)-1-phenylethyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C22H22N4O3
assistant