You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 1-[3-[[5-[(2,5-dimethylphenoxy)methyl]-1,3,4-oxadiazol-2-yl]sulfanylmethyl]-4-methoxyphenyl]ethanone ?
user
C21H22N2O4S
assistant