You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-methoxy-2-(methoxymethyl)-5-methyl-N-[1-(2-methylpropyl)indol-5-yl]thieno[2,3-d]pyrimidine-6-carboxamide into its molecular formula.
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C23H26N4O3S
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