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 (5S)-3-[3-fluoro-4-[6-[[(6S)-2-nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin-6-yl]oxy]pyridazin-3-yl]phenyl]-5-(hydroxymethyl)-1,3-oxazolidin-2-one .
user
C20H17FN6O7
assistant