You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-[(E)-[(5S)-5-(2-bromo-4-ethoxy-5-methoxyphenyl)-6-ethoxycarbonyl-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidin-2-ylidene]methyl]benzoic acid into molecular formula.
user
C27H25BrN2O7S
assistant