You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-(2,5-dimethylthiophen-3-yl)ethyl]-4-(3-propyl-1,2,4-oxadiazol-5-yl)butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H25N3O2S
assistant