You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule ethyl 4-[2-[2-(1,3-dioxoisoindol-2-yl)acetyl]hydrazinyl]-5-methylthieno[2,3-d]pyrimidine-6-carboxylate .
user
C20H17N5O5S
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