You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R,4aR,8aS)-N,N-diethyl-1,2,3,4,4a,5,6,7,8,8a-decahydroquinolin-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H26N2
assistant