You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[[3-(2,4-dimethoxyphenyl)-1,2,4-oxadiazol-5-yl]methylamino]phenyl]sulfanylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20N4O4S
assistant