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 (6Z)-6-[[1-[(2-chlorophenyl)methyl]pyrrol-2-yl]methylidene]-5-imino-2-piperidin-1-yl-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one .
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C22H21ClN6OS
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