You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(cyclopropylmethyl)-N-[(1-ethyl-5-morpholin-4-ylsulfonylbenzimidazol-2-yl)methyl]propan-1-amine into its molecular formula.
user
C21H32N4O3S
assistant