You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[4-(2,3,3a,4,5,6,7,7a-octahydroindol-1-yl)phenyl]methyl]-2-methylpropan-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H30N2
assistant