You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[4-ethyl-5-[(3-methylphenyl)methyl]-6-[4-(2-methylpropanoyl)piperazin-1-yl]pyrimidin-2-yl]acetonitrile .
user
C24H31N5O
assistant