You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[5-[(pyridin-3-ylmethylamino)methyl]furan-2-yl]-5,6,7,8-tetrahydro-2H-isoquinolin-1-one .
user
C20H21N3O2
assistant