You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-chloro-5-oxo-2,3-dihydro-[1,3]thiazolo[3,2-a]pyrimidine-6-carbaldehyde The above is the IUPAC name of a molecule. Write its molecular formula.
user
C7H5ClN2O2S
assistant