You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-[1-[(5,8-dimethyl-4-oxo-1H-quinolin-2-yl)methyl]-3-oxopiperazin-2-yl]-N-methylacetamide ?
user
C19H24N4O3
assistant