You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-benzyl-2-[(2R)-1-methoxypropan-2-yl]-7,8-dihydro-5H-pyrido[3,4-b]pyrazin-3-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N4O
assistant