You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S,2R,3S,4R,5R,6R)-3,4-di(butanoyloxy)-2,5,6-trihydroxycyclohexyl] butanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H30O9
assistant