You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(4-amino-3,5-dibromophenyl)methyl-(2,2-diphenylacetyl)amino]-5-(diaminomethylideneamino)pentanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H30Br2N6O2
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