You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (3R,6S,7R,8S,8aS)-6,7,8-trihydroxy-5-oxo-2,3,6,7,8,8a-hexahydro-[1,3]thiazolo[3,2-a]pyridine-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C9H13NO6S
assistant