You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[(1-methylimidazol-2-yl)methyl]-1,2,3,4-tetrahydroisoquinoline-3-carboxamide;dihydrochloride is given. What is its corresponding molecular formula?
user
C15H20Cl2N4O
assistant