You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[1-[4-amino-3-(2,3-difluoro-4-methoxyphenyl)pyrazolo[3,4-d]pyrimidin-1-yl]ethyl]-5-chloro-3-(3,3-dimethylpiperazin-1-yl)quinazolin-4-one is given. What is its corresponding molecular formula?
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C28H28ClF2N9O2
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