You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(3-chloro-4-methoxyphenyl)-1,3-thiazol-2-yl]-2-[(2-cyanophenyl)sulfonyl-methylamino]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H17ClN4O4S2
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