You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(2-methylpyrimidin-4-yl)piperazin-1-yl]-(2-methyl-1H-pyrrol-3-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H19N5O
assistant