You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[benzenesulfonyl-[(4-phenylphenyl)methylamino]methylidene]-5-imino-2,8-dimethyl-2,3-dihydroimidazo[1,2-a]pyrimidin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H27N5O3S
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