You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[1-[2-(2-fluorophenyl)-8-methyl-1-methylideneisoquinolin-3-yl]ethyl]-7H-purin-6-amine by IUPAC nomenclature, provide its molecular formula.
user
C24H21FN6
assistant