You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,5-dimethoxyphenyl)-1-[3-[(2S)-2-methylpiperidin-1-yl]azetidin-1-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H28N2O3
assistant