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What is the molecular formula of the compound with this IUPAC name 2-[(2,9-dimethyl-6,13-diaza-17-azoniatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),2,4,6,8,11(16),12,14-octaen-7-yl)azaniumyl]ethyl-diethylazanium ?
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