You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2R)-2-(5-fluoro-2-methoxyphenyl)-2-(3-oxobutoxy)ethyl]-5-methyl-3-[(3S)-2-oxopiperidin-3-yl]-6-(triazol-2-yl)thieno[2,3-d]pyrimidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H29FN6O6S
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