You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3S)-8-(4-fluorobenzoyl)-4-(2-methylbenzoyl)-N-[(1R)-1-phenylethyl]-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C31H32FN3O4
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