You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-N-benzyl-3-N-propan-2-yl-5-N-(2,4,6-trimethylphenyl)-1,2,4-triazine-3,5-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N5
assistant