You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(4-ethoxyphenyl)-2-[(4S)-1-ethyl-3-(2-morpholin-4-ylethyl)-5-oxo-2-sulfanylideneimidazolidin-4-yl]acetamide into its molecular formula.
user
C21H30N4O4S
assistant