You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5Z)-5-[(3aR,4R,5R,6aR)-3-fluoro-4-[(E,3R)-4-fluoro-3-hydroxyoct-1-enyl]-5-methyl-3,3a,4,5,6,6a-hexahydrocyclopenta[b]furan-2-ylidene]pentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H32F2O4
assistant