You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3S,4S,5R,6R)-2-(hydroxymethyl)-6-[[(1R,12S)-5,7,11,19-tetraoxapentacyclo[10.8.0.02,10.04,8.013,18]icosa-2,4(8),9,13(18),14,16-hexaen-16-yl]oxy]oxane-3,4,5-triol is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22O10
assistant