You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3,5-dimethoxyphenyl)-[(2R)-2-[[(2S,6S)-2,6-dimethylmorpholin-4-yl]methyl]pyrrolidin-1-yl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C20H30N2O4
assistant