You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-butyl-2-[2-(2,5-dimethyl-1-phenylpyrrol-3-yl)-2-oxoethyl]sulfanylbenzimidazole-5-sulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H28N4O3S2
assistant