You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-(4-bromophenyl)ethyl]-4-methyl-2-(N-methylanilino)-1,3-thiazole-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20BrN3OS
assistant