You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-N-[(6-methyl-8,9-dihydro-7H-pyrido[2,3-b]azepin-5-yl)methyl]-5-(1-methylpyrazol-4-yl)pyrazine-2,3-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H22N8
assistant