You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-[(1,1-dioxothiolan-3-yl)amino]-1-oxopropan-2-yl] 1-(5,6-dimethylthieno[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28N4O5S2
assistant