You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(3-chloro-4-propan-2-yloxyphenyl)-2-oxoethyl]-3-methyl-1-[(2-phenyl-3H-benzimidazol-5-yl)methyl]urea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H27ClN4O3
assistant