You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-methyl-4-[2-(2-methylprop-2-enoxy)ethylamino]thieno[2,3-d]pyrimidine-6-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C14H17N3O3S
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