You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,5R,6S,6aR)-5-butyl-6-[(2-fluorofuran-3-yl)methoxy]-2-methyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H21FO5
assistant