You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 8-[(2E)-2-[(5-bromo-2-methoxyphenyl)methylidene]hydrazinyl]-3-methyl-7-[(4-methylphenyl)methyl]purine-2,6-dione .
user
C22H21BrN6O3
assistant