You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7E,9E)-11-[(2R,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-methoxyoxan-2-yl]oxyoctadeca-7,9-dienoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H44O8
assistant