You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[(4R)-3,4-dihydro-2H-chromen-4-yl]-N-ethenyl-N-(5-fluoro-2-methylphenyl)-8-methylpurin-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H22FN5O
assistant