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Under IUPAC nomenclature, a molecule named 11,12-dimethyl-4-(2-methylpropyl)-10-phenyl-3,5,6,8,10-pentazatricyclo[7.3.0.02,6]dodeca-1(9),2,4,7,11-pentaene is given. What is its corresponding molecular formula?
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C19H21N5
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