You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-amino-N-(2-fluorophenyl)-6-methyl-7,8-dihydro-5H-thieno[2,3-b][1,6]naphthyridine-2-carboxamide .
user
C18H17FN4OS
assistant