You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(2,6-dichlorophenyl)acetyl]-[(2,6-dichlorophenyl)methyl]amino]-3-phenyl-N-propan-2-ylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26Cl4N2O2
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