You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N,N-dimethyl-5-[[(2R,6S)-2-phenyl-6-propan-2-ylmorpholin-4-yl]methyl]pyrimidin-2-amine into its molecular formula.
user
C20H28N4O
assistant