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 (5S)-2-[2-[4-[2-[(5S)-4-hydroxy-6-(hydroxymethyl)-5-methoxyoxan-2-yl]ethynyl]phenyl]ethynyl]-6-(hydroxymethyl)oxane-3,4,5-triol .
user
C23H28O9
assistant