You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3R,3aR,6R,6aR)-3-(propylsulfonylamino)-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-6-yl] N-(4-acetylphenyl)carbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N2O7S
assistant