You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(3-chlorophenyl)-N-[(2-chlorophenyl)methyl]-6,7-dihydro-4H-[1,3]thiazolo[5,4-c]pyridine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H17Cl2N3OS
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