You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2R)-4-[cyclopropyl-[3-(fluoromethyl)phenyl]methyl]-2-methylpiperazin-1-yl]acetic acid;dihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27Cl2FN2O2
assistant