You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2S,3S,4S,5R,6R)-6-[(2R,3R,4S,5S,6S)-6-carboxy-2,4,5-trihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid .
user
C12H18O13
assistant