You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(1S)-4-[5-(3-cyano-4-hydroxyphenyl)-1,2,4-oxadiazol-3-yl]-2,3-dihydro-1H-inden-1-yl]sulfamoyl]-N-methylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H19N5O5S
assistant