You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 7-hydroxy-1-[4-(2-hydroxy-3-methylphenyl)phenyl]-5-oxo-4H-pyrrolo[3,2-b]pyridine-6-carbonitrile ?
user
C21H15N3O3
assistant