You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-(4-fluorophenyl)-1-[4-(methylamino)-2-pyrrolidin-2-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-6-yl]ethanone is given. What is its corresponding molecular formula?
user
C20H24FN5O
assistant