You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-(trifluoromethyl)-4-[[(2S)-1-[6-[4-[5-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl]pyrimidin-4-yl]oxypropan-2-yl]amino]-1H-pyridazin-6-one by IUPAC nomenclature, provide its molecular formula.
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C21H21F6N9O2
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