You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-amino-5-ethyl-N-(2-fluorophenyl)-6,7,8,9-tetrahydrothieno[2,3-c]isoquinoline-2-carboxamide .
user
C20H20FN3OS
assistant