You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-6-amino-4-(5-bromo-2-phenylmethoxyphenyl)-3-(2,5-dimethoxyphenyl)-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
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C28H23BrN4O4
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