You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(4-methylphenoxy)-N-[(3-methylphenyl)methyl]-N-[(2R)-1-(2-methylpropylamino)-1-oxopropan-2-yl]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H36N2O3
assistant