You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-[[4-[5-(4-ethylphenyl)-1,2,4-oxadiazol-3-yl]phenyl]sulfanylamino]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N3O3S
assistant