You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-[(2R)-2-[(2R)-2-cyanopropoxy]-2-(5-fluoro-2-methoxyphenyl)ethyl]-5-methyl-2,4-dioxo-6-(triazol-2-yl)thieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H27FN6O6S
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