You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,6-dimethylpyrimidin-4-yl)-N-methyl-N-[[(2R)-oxan-2-yl]methyl]piperidin-4-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H30N4O
assistant