You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5R)-5-(8-methoxy-2H-chromen-3-yl)-1,5,6,8-tetrahydropyrazolo[4,3-g]quinolin-7-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H17N3O3
assistant