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 propan-2-yl 4-[(3S,5aR,6R,7R,8aS)-6-[(E,3R)-4-(2,5-difluorophenoxy)-3-(oxan-2-yloxy)but-1-enyl]-7-hydroxy-3,4,5,5a,6,7,8,8a-octahydro-2H-cyclopenta[b]oxepin-3-yl]butanoate .
user
C31H44F2O7
assistant