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 N-[3-[methyl(phenyl)sulfamoyl]phenyl]-2-[(5-thiophen-2-yl-1,3,4-oxadiazol-2-yl)sulfanyl]acetamide .
user
C21H18N4O4S3
assistant