You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 2-[[furan-2-ylmethyl(2-hydroxyhex-5-enyl)amino]methyl]-5-methyl-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate into its molecular formula.
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C21H25N3O5S
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