You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,4S,5S,6R)-2-(3-phenylprop-2-ynyl)-6-[[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxane-2,3,4,5-tetrol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28O11
assistant