You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-methyl-N-[[1-(1-methyl-6-oxopyridazin-4-yl)pyrrolidin-3-yl]methyl]-6-oxo-1H-pyrimidine-5-carboxamide is given. What is its corresponding molecular formula?
user
C16H20N6O3
assistant