You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule tert-butyl (1R,3S,5R)-5-(aminomethyl)-3-[(6-bromo-3-cyclopropylpyridin-2-yl)carbamoyl]-2-azabicyclo[3.1.0]hexane-2-carboxylate .
user
C20H27BrN4O3
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