You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(3R)-1-[2-(3,5-dimethyl-1H-pyrazol-4-yl)acetyl]piperidin-3-yl]-7,8-dihydro-6H-pyrrolo[1,2-a]pyrimidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H25N5O2
assistant