You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [4-[5-(2,7-dimethyl-1H-indol-4-yl)-1,2,4-oxadiazol-3-yl]phenyl]methanesulfonamide .
user
C19H18N4O3S
assistant