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 3-[5-[4-(3,5-dimethylpyridin-2-yl)piperazine-1-carbonyl]pyridin-2-yl]-3-ethylpyrrolidine-2,5-dione .
user
C23H27N5O3
assistant