You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[5-[6-chloro-5-[(2-methoxy-4-methylphenyl)sulfonylamino]pyridin-3-yl]-4-methyl-1,3-thiazol-2-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19ClN4O4S2
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