You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 4-methyl-1-(1-methyl-4-piperidin-1-ylsulfonylpyrrole-2-carbonyl)piperidine-2-carboxylic acid ?
user
C18H27N3O5S
assistant