You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2R,3R,4S,5S,6R)-2-[[(1R,4S,4aR,8aR)-4-hydroxy-6-(1-hydroxypropan-2-yl)-4,8a-dimethyl-1,2,3,4a,5,8-hexahydronaphthalen-1-yl]oxy]-6-(hydroxymethyl)oxane-3,4,5-triol .
user
C21H36O8
assistant