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 1-cyclopropyl-6-fluoro-7-[4-(methylamino)-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]-4-oxo-1,8-naphthyridine-3-carboxylic acid;hydrochloride .
user
C21H21ClFN3O3S
assistant