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What is the molecular formula of the compound with this IUPAC name (3R)-1'-amino-6,9,11,11-tetramethyl-2-oxospiro[1-azatricyclo[6.3.1.04,12]dodeca-4,6,8(12),9-tetraene-3,3'-5H-pyrido[1,2-a]benzimidazole]-2',4'-dicarbonitrile ?
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C27H22N6O
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