You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2S)-1-[2-[4-(difluoromethylidene)-2-oxo-1,3-oxazolidin-3-yl]-3-methyl-5,6-dihydroimidazo[1,2-d][1,4]benzoxazepin-9-yl]pyrrolidine-2-carboxamide is given. What is its corresponding molecular formula?
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C21H21F2N5O4
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