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 N-(2-cyanoethyl)-2-[[5-[4-(difluoromethoxy)phenyl]-1,3,4-oxadiazol-2-yl]sulfanyl]-N-(2-fluorophenyl)acetamide .
user
C20H15F3N4O3S
assistant