You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,8aR)-6-(6-propan-2-yloxypyrazin-2-yl)-2,3,3a,4,5,7,8,8a-octahydro-1H-pyrrolo[3,4-d]azepine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H24N4O
assistant