You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-hydroxy-2-(thiophen-3-ylmethyl)-7,8,9,10-tetrahydro-3H-benzo[f]quinoline-4-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19NO3S
assistant