You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-[[3-bromo-4-[(2,4-dichlorophenyl)methoxy]-5-methoxyphenyl]methyl]butan-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22BrCl2NO2
assistant