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 2-[[5-[4-(difluoromethoxy)phenyl]-1,3,4-oxadiazol-2-yl]sulfanyl]-N-(1,1-dioxothiolan-3-yl)-N-ethylpropanamide .
user
C18H21F2N3O5S2
assistant