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 4-(3,5-dimethylphenyl)-N-[2-(3-methoxy-5,6-dimethylpyrazin-2-yl)ethyl]piperazine-1-carboxamide ?
user
C22H31N5O2
assistant