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What is the molecular formula of the molecule identified by 12-(2,6-dimethylphenyl)-3,3,6,6-tetramethylspiro[21-oxa-12-aza-19-azoniahexacyclo[15.3.1.02,7.09,20.011,19.013,18]henicosa-1,7,9(20),11(19),13(18),14,16-heptaene-10,6'-pyrido[2,1-a]isoindol-5-ium] ?
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C41H37N3O+2
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