You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1S,2R,7R,8R,8aR)-1,2,8-trihydroxy-1,2,3,5,6,7,8,8a-octahydroindolizin-7-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C10H18N2O4
assistant