You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3,3-difluoro-2,2-dimethylbutyl)amino]-N-[(1-ethylimidazol-2-yl)methyl]-N-methyl-1,3-benzothiazole-5-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H27F2N5O2S2
assistant