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 (5aS,10bR)-10-(2-methylphenyl)-1,2,3,4,5,5a,6,10b-octahydroazepino[4,5-b]indole .
user
C19H22N2
assistant