You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[4-[2-(dimethylamino)ethyl]-2,3-dihydroquinoxalin-1-yl]-3-thiophen-2-ylpropan-1-one into its molecular formula.
user
C19H25N3OS
assistant