You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,5-dimethylphenyl)-2-[[5-[(4-methoxyphenyl)methyl]-1,3,4-oxadiazol-2-yl]sulfanyl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20N2O3S
assistant