You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-[[5-(2-methoxyphenyl)-1,2-oxazole-3-carbonyl]amino]-1-benzothiophene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H18N2O5S
assistant