You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,4S,5S)-2-[[(2R,3R)-3,7-dihydroxy-2-(4-hydroxyphenyl)-3,4-dihydro-2H-chromen-5-yl]oxy]-6-(hydroxymethyl)oxane-3,4,5-triol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24O10
assistant