You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 1-(3,4,4a,5,6,7,8,8a-octahydro-2H-1,5-naphthyridin-5-ium-1-yl)-2-amino-2-methylpropan-1-one ?
user
C12H24N3O+
assistant