You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (4R)-4-[(6a-acetyl-2,3,3a,4,5,6-hexahydro-1H-pentalen-2-yl)amino]-3,4-dihydro-2H-chromene-6-carbonitrile;3-ethyl-2-propyl-5-(trifluoromethyl)pyridine by IUPAC nomenclature, provide its molecular formula.
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C31H38F3N3O2
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