You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(4R)-4-methoxyheptyl]-2-methyl-5-(2-methyl-5-propylphenyl)-1,2,4-oxadiazol-3-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H35N3O2
assistant