You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-1-[(8R)-2-pyridin-3-ylspiro[5,7-dihydropyrano[4,3-d]pyrimidine-8,3'-pyrrolidine]-1'-yl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22N4O2
assistant