You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (2R)-N-[(4-fluorophenyl)methyl]-2-[[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]propanamide ?
user
C18H15F2N3O2S
assistant