You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3R,4R,5R,6S)-2-[(2R,3S,4R,5R,6R)-4,5-dihydroxy-2-(hydroxymethyl)-6-[[(1R,2S,4S,6R,7S,8R,9S,12S,13S,16S)-6-hydroxy-7,9,13-trimethyl-6-[(3R)-3-methyl-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybutyl]-5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosan-16-yl]oxy]oxan-3-yl]oxy-6-methyloxane-3,4,5-triol is the IUPAC name of a molecule. Please give its molecular formula.
user
C45H76O18
assistant