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 (9S)-9-amino-2,5,6,7,8,9-hexahydrocyclohepta[c]pyridazin-3-one;N-[4-bromo-3-(trifluoromethyl)phenyl]acetamide .
user
C18H20BrF3N4O2
assistant