You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 3-[(3R)-3-[4-(2,5-dimethylphenyl)piperazine-1-carbonyl]piperidin-1-yl]-1-methylquinoxalin-2-one ?
user
C27H33N5O2
assistant