You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named propan-2-yl (2S)-3-[(4aS,6R,7R,7aS)-6-[2-amino-6-(methylamino)purin-9-yl]-4a,7-difluoro-7-methyl-2-oxo-6,7a-dihydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-2-yl]-2-methylpropanoate by IUPAC nomenclature, provide its molecular formula.
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C19H27F2N6O6P
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