You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[(Z)-(3-bromophenyl)methylideneamino]-2-(2-methyl-5-propan-2-ylphenoxy)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23BrN2O2
assistant