You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3aR,10aR)-1-methyl-6-octyl-3,3a,4,5,7,8,9,10-octahydro-2H-pyrrolo[2,3-j]isoquinolin-7-ylium ?
user
C20H35N2+
assistant