You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] (1S,4S,8R,10S,11S,14S)-11-ethyl-12-oxo-7,9,13-trioxatetracyclo[6.5.1.01,10.04,14]tetradeca-2,5-diene-5-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24O11
assistant