You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (5-amino-3,4-dihydro-2H-quinolin-1-yl)-(6-methoxy-2H-chromen-3-yl)methanone;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C20H21ClN2O3
assistant