You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (2E)-2-benzylidene-5-(2,5-dimethoxyphenyl)-3-oxo-7-propyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H28N2O5S
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