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 6-[2-oxo-2-[4-(thiophen-2-ylmethyl)piperazin-1-yl]ethoxy]-3,4-dihydro-1H-quinolin-2-one ?
user
C20H23N3O3S
assistant