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system
Name the molecular formula for the molecule established as ethyl (3S)-7-[2-[bis[(2-methylpropan-2-yl)oxycarbonyl]amino]-5-chlorophenyl]-5-oxo-2,3-dihydro-1H-indolizine-3-carboxylate using the IUPAC nomenclature.
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C27H33ClN2O7
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