You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named [4-[[7-(2-chloro-5-methylphenyl)-6-methyl-1,2,4-benzotriazin-3-yl]amino]phenyl]-(4-methylpiperazin-1-yl)methanone is given. What is its corresponding molecular formula?
user
C27H27ClN6O
assistant