You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 5-(2-bromo-5-methoxyphenyl)-4-chloro-7-cyclohexylpyrrolo[2,3-d]pyrimidine is given. What is its corresponding molecular formula?
user
C19H19BrClN3O
assistant