You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3,4-dihydro-1H-isoquinolin-2-yl)-1-(5-methyl-1-pyrimidin-2-ylpyrazol-4-yl)propan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21N5O
assistant