You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 1-(7-chloro-1-methyl-2-oxo-5-phenyl-3H-1,4-benzodiazepin-3-yl)-3-[(5-methylpyrazin-2-yl)methyl]thiourea into molecular formula.
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C23H21ClN6OS
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