You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[3-(3,4-dichlorophenyl)-2-phenyl-3,4-dihydropyrazol-5-yl]-N-phenylbenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H21Cl2N3O2S
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