You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[2,3-difluoro-4-(6-hydroxyhex-1-ynyl)phenyl]methyl]-3-[(2S)-2-[2-(2,3-dimethoxyphenyl)-4-(trifluoromethyl)phenyl]cyclobutanecarbonyl]-4-hydroxy-4a-methyl-6,7-dihydro-5H-pyrrolo[1,2-b]pyridazin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C41H41F5N2O6
assistant