You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3R,4S,5R)-2-[(1S,2S,4S,6S,7S,8R,9R,12R,13R,14R,16R)-8,16-dihydroxy-7,9,13-trimethyl-5'-methylidenespiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-18-ene-6,2'-oxane]-14-yl]oxyoxane-3,4,5-triol is the IUPAC name of a molecule. Please give its molecular formula.
user
C32H48O9
assistant