You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 4-[(5,7-dichloro-1-methyl-3,4-dihydro-1H-isoquinoline-2-carbonyl)amino]butanoic acid is given. What is its corresponding molecular formula?
user
C15H18Cl2N2O3
assistant