You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(2-cyclopentylpyrrolidin-1-yl)-3-oxopropyl]-N,N,1-triethylbenzimidazole-5-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H38N4O3S
assistant