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Name the molecular formula for the molecule established as methyl 2-[(6R)-4-(3-chloro-4-cyano-2-methylphenyl)-3,5-dioxo-2,4,8-triazatricyclo[5.2.1.02,6]decan-8-yl]-2-oxoacetate using the IUPAC nomenclature.
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C18H15ClN4O5
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