You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (2E,5S)-5-(5-chloro-2-methoxyphenyl)-2-[[4-(2-ethoxy-2-oxoethoxy)-3-methoxyphenyl]methylidene]-3-oxo-7-propyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H33ClN2O8S
assistant