You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-amino-5,6,7,8-tetrahydrothieno[2,3-b]quinolin-2-yl)-(3,5-dimethylpiperidin-1-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N3OS
assistant