You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,3,3a,4,5,6,7,7a-octahydro-1H-indol-2-ylmethyl)-N-ethylcyclohexanamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H32N2
assistant