You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,2-dimethyl-9-oxo-12-thiophen-2-yl-4,5-dihydro-3H-[1]benzofuro[5,4-a]quinolizine-8-carboxylic acid;ethane;2-methylpropane by IUPAC nomenclature, provide its molecular formula.
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C28H35NO4S
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