You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-4-ethyl-1,2,3,4-tetrahydro-[1,4]oxazepino[7,6-c]quinoline;dihydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H18Cl2N2O
assistant