You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3S,4S,5R,6S)-2-[[(2R,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxymethyl]-6-(4-prop-2-enylphenoxy)oxane-3,4,5-triol is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H28O10
assistant