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system
Name the molecular formula for the molecule established as ethyl (1R,9S,13E,16S)-13-[(2-chlorophenyl)methylidene]-9-methyl-14-oxo-8-oxa-12-thia-10,15-diazatetracyclo[7.6.1.02,7.011,15]hexadeca-2,4,6,10-tetraene-16-carboxylate using the IUPAC nomenclature.
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C23H19ClN2O4S
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