You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-acetyl-2-(6,20-diethyl-7,7,9,17,19,19-hexamethyl-2-oxa-20-aza-6-azoniapentacyclo[12.8.0.03,12.05,10.016,21]docosa-1(14),3,5,8,10,12,15,17,21-nonaen-13-yl)benzoate by IUPAC nomenclature, provide its molecular formula.
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C38H40N2O4
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