You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(1R)-1-[2-(4-methoxy-2,5-dimethylphenyl)imidazol-1-yl]ethyl]-2-methylpyridine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23N3O
assistant