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system
What is the molecular formula of the molecule 2-[2-[3',6'-bis(diethylamino)-3-oxospiro[isoindole-1,9'-xanthene]-2-yl]ethyl]-6-[bis(pyridin-2-ylmethyl)amino]benzo[de]isoquinoline-1,3-dione ?
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C54H51N7O4
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