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-N-[(1'S,3R)-spiro[1H-2-benzofuran-3,5'-cyclopent-2-ene]-1'-yl]benzenesulfonamide ?
user
C19H19NO3S
assistant