You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(4-cyclopentyl-5-oxo-[1,2,4]triazolo[4,3-a]quinazolin-1-yl)sulfanyl]-N-(5-ethyl-1,3,4-thiadiazol-2-yl)acetamide into its molecular formula.
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C20H21N7O2S2
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