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system
Name the molecular formula for the molecule established as 3-[10-(4-chlorophenyl)-12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-11-yl]propanoic acid using the IUPAC nomenclature.
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C18H15ClN2O3S
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