You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-(2-chloro-6-fluorophenyl)-5-fluoro-4-(5,6,7,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyrazin-2-yl)-2-[(2S)-1,1,1-trifluoropropan-2-yl]oxybenzamide by IUPAC nomenclature, provide its molecular formula.
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C21H17ClF5N5O2
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