You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3'R,4'S,5'S,6'R)-6-chloro-5-[(4-ethylphenyl)methyl]-6'-(hydroxymethyl)spiro[2H-1-benzofuran-3,2'-oxane]-3',4',5'-triol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H25ClO6
assistant