You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[[5-(5-methylsulfonyl-1-benzofuran-2-yl)-1,2,4-oxadiazol-3-yl]methyl]piperidine-1-carboxylic acid .
user
C18H19N3O6S
assistant