You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[[(3R)-1-[(1R)-1-(6-methoxypyridin-2-yl)ethyl]piperidin-3-yl]methyl]-2,6-dimethylpyridine .
user
C21H29N3O
assistant