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What is the molecular formula of the molecule identified by 1-(2-hydroxyphenyl)-5-(3-nitrophenyl)-3-[(4-nitrophenyl)methyl]-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylic acid ?
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C26H20N4O9
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