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-[(1R)-2-methyl-1-(3-methyl-1,2,4-oxadiazol-5-yl)propyl]-4-(4-methylphenyl)butanamide .
user
C18H25N3O2
assistant