You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 6-[6-[(2-carboxyacetyl)oxymethyl]-2,4,5-trihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid .
user
C15H22O15
assistant