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What is the molecular formula of the molecule 13-chloro-10-(1-phenylethyl)-3,16-dioxapentacyclo[16.2.2.04,15.05,12.06,11]docosa-1(21),4,6(11),7,9,12,14,18(22),19-nonaene-2,17-dione ?
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C28H17ClO4
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