You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(5,7-dioxo-6-propyl-[1,2]thiazolo[4,3-d]pyrimidin-4-yl)-N-propan-2-ylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H18N4O3S
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