You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-(6-chloro-5-phenyl-1H-indazol-3-yl)-3-[3-(4-methylpiperazin-1-yl)propyl]urea by IUPAC nomenclature, provide its molecular formula.
user
C22H27ClN6O
assistant