You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (3aR,4R,9bR)-4-(2,4-dichlorophenyl)-2,3,3a,4,5,9b-hexahydrofuro[3,2-c]quinoline-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17Cl2NO3
assistant