You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-[[5-(6,6-difluoro-3-azabicyclo[3.1.0]hexan-3-yl)-3-methylpyrazin-2-yl]methyl]-N-[(6R)-3-methyl-5,6-dihydro-4H-cyclopenta[d]imidazol-6-yl]triazole-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C21H23F2N9O
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