You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinolin-2-yl-(5-aminopyrazin-2-yl)methanone .
user
C14H20N4O
assistant