You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[5-(2-morpholin-4-yl-2-oxoethyl)thiophen-2-yl]-2-oxoethyl] 2-(4-methylphenyl)acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23NO5S
assistant