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What is the molecular formula of the molecule propan-2-yl (2S)-4-[[(2S,4aR,6R,7R,7aR)-6-(4-amino-5-fluoropyrrolo[2,3-d]pyrimidin-7-yl)-7-chloro-7-methyl-2-oxo-4,4a,6,7a-tetrahydrofuro[3,2-d][1,3,2]dioxaphosphinin-2-yl]oxy]-2-methylbutanoate ?
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