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What is the molecular formula of the molecule identified by (4S,11E)-18,19-dichloro-2-oxo-14-oxa-3,7,9-triazatricyclo[13.3.1.16,9]icosa-1(18),6(20),7,11,15(19),16-hexaene-4-carboxylic acid ?
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C17H15Cl2N3O4
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