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 1-[2-fluoro-4-methyl-5-[2-methyl-7-(methylamino)-1,6-naphthyridin-3-yl]phenyl]-3-[2-(trifluoromethoxy)ethyl]urea;hydrochloride .
user
C21H22ClF4N5O2
assistant