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 methyl 3-[(3-chlorophenyl)methylcarbamoyl]-5-oxo-1-sulfanylidene-4H-[1,3]thiazolo[3,4-a]quinazoline-8-carboxylate .
user
C20H14ClN3O4S2
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