You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl (2Z,5S)-2-[[5-bromo-2-[(3-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-5-(2-chlorophenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C31H25BrCl2N2O5S
assistant