You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-methyl-1-[3-[2-(5-methyl-1,2,4-oxadiazol-3-yl)ethyl]imidazol-4-yl]butan-1-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H21N5O
assistant