You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(E)-2-cyclopentylethenyl]-3-methyl-1-(2-methylpropyl)-6-[[2-(trifluoromethyl)phenyl]methyl]thieno[2,3-d]pyrimidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H29F3N2O2S
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