You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R,4S,5S,6R)-2-[(1R,2S,4S,5'S,6R,7S,8R,9S,12S,13R,16S,18R,19S)-16-hydroxy-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6,2'-oxane]-19-yl]oxy-6-methyloxane-3,4,5-triol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C33H54O8
assistant