You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(3,4-dimethoxyphenyl)ethyl]-5-imino-4-(6-piperidin-1-yl-1H-benzimidazol-2-yl)-2H-pyrrol-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H31N5O3
assistant