You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[4-[[[4-chloro-5-methyl-2-(2-piperazin-1-ylethoxy)phenyl]carbamoylamino]methyl]phenoxy]-N-methylpyridine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H33ClN6O4
assistant