You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S,5S)-1-[4-(dimethylamino)phenyl]-5-[1-(4-methylphenyl)pyrrol-2-yl]-4-pyridin-2-ylimidazolidine-2-thione is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H27N5S
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