You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,10bR)-10b-methyl-4-[(1R)-1-phenylethyl]-1,2,3,4a,5,6-hexahydrobenzo[f]quinoline The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H27N
assistant