You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 4-[(E)-[(5-chloro-3-methyl-1H-indole-2-carbonyl)hydrazinylidene]methyl]benzoic acid is given. What is its corresponding molecular formula?
user
C18H14ClN3O3
assistant