You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(3-chlorophenyl)ethyl]-6-methyl-1-(2-phenylethenyl)pyrazolo[3,4-d]pyrimidin-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20ClN5
assistant