You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-amino-3-[(1R,6R,8R,9R,10R,15S,17R)-8-(6-aminopurin-9-yl)-9-fluoro-3-hydroxy-3,12,12-trioxo-2,4,7,11,16-pentaoxa-12lambda6-thia-3lambda5-phosphatricyclo[13.2.1.06,10]octadecan-17-yl]-6H-triazolo[4,5-d]pyrimidin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23FN11O10PS
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