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system
Provide the molecular formula for the IUPAC named substance 2-(3a-methyl-1,5-dioxo-2,3-dihydropyrrolo[1,2-a]quinazolin-4-yl)-N-[3-(2,3-dichlorophenoxy)-2-hydroxypropyl]acetamide .
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C23H23Cl2N3O5
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