You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[(3,4-dimethoxyphenyl)methyl]-N-[(3-methylthiophen-2-yl)methyl]-1-[(2R)-oxolan-2-yl]methanamine into its molecular formula.
user
C20H27NO3S
assistant