You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[2-(2-oxopyrrolidin-1-yl)ethylcarbamoyl]phenyl]-1-sulfamoylpyrrole-2-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H20N4O6S
assistant